He asked what the issue of sovereignty has to do with us?
The WTS claims that each individual Christian [JW] has the responsibility of upholding Jehovah's sovereignty, the way loyal subjects of a kingdom have a responsibility to uphold a monarch's rulership. To do otherwise would be an act of treason [rebellion] against the government. JWs believe that Satan the Devil™ challenged Jehovah's rightful sovereignty in the Garden of Eden™, and that righteous worshipers of Jehovah over the centuries since then have demonstrated their loyalty to Jehovah's chosen form of government. According to JWs, Jehovah's Kingdom™ was established in heaven in 1914, having cast Satan from heaven to the realm of the earth where he is misleading people to follow him. People who are loyal to Jehovah may be spared destruction at Armageddon™ and may be rewarded for their loyalty with Living Forever In Paradise On Earth™, while the rest of mankind (i.e., 99.999% of the earth's population) will be destroyed.
Why do we have to suffer because of what Satan did?
We aren't technically suffering because of what Satan the Devil™ did, we are suffering because of Adam's sin. We are flawed - Imperfect™ - because of Adam's sin, and we need redemption, which Jesus provided by his death. Unfortunately, Jesus' paying for our sins isn't quite enough, because otherwise we wouldn't be required to prove anything to anyone, let alone God, who is supposed to know us better than we know ourselves. We need to work our little hineys off banging on doors and trying to get people to listen to the message that emanates forth from the printing presses in Brooklyn, park our backsides on uncomfortable chairs for 5 hours a week listening to more messages (repetition of messages, really) that emanate from the printing presses in Brooklyn, and spend even more time in deep personal study of messages emanating from the printing presses in Brooklyn. Even better, we should give as much of our hard earned money as we can to support those printing presses, because surely God can't do that, and at the same time, we shouldn't expect to live too comfortably because that might damage our Faith™.
Satan has been proven a liar over and over again, so why do we have to keep paying the price? It doesn't seem fair.
Really? Has Satan been proven a liar? Read the conversations between God and Adam and the one between Eve and the serpent again.
And Jehovah God proceeded to take the man and settle him in the garden of Eden to cultivate it and to take care of it. And Jehovah God also laid this command upon the man: "From every tree of the garden you may eat to satisfaction. But as for the tree of the knowledge of good and bad you must not eat from it, for in the day you eat from it you will positively die." ~ Genesis 2:15-17.
Now the serpent proved to be the most cautious of all the wild beasts of the field that Jehovah God had made. So it began to say to the woman: "Is it really so that god said you must not eat from every tree of the garden?" At this the woman said to the serpent: "Of the fruit of the trees of the garden we may eat. But as for [eating] of the fruit of the tree that is in the middle of the garden, God has said, 'You must not eat from it, no, you must not touch it that you do not die.'" At this the serpent said to the woman: "You positively will not die. For God knows that in the very day of your eating from it your eyes are bound to be opened and you are bound to be like God, knowing good and bad." ~ Genesis 3:1-5
It seems to me that God's threat was an empty one - he did not kill Adam and Eve immediately upon discovering that they'd eaten the fruit. And, why, pray tell, would a loving God want his most superlative creation, the ones made in his own image, to NOT have the capacity to know good and bad in the first place? It seems that if God was making man in his own image, that moral compass would be required equipment, don't you think? So, in other words, God deliberately made Adam and Eve defective [not in his image, after all] by not installing the knowledge of good and bad that he had himself, and actually withheld that capacity from them, plus God was the one lying about (a) making man in his own image and (b) that eating from the tree would result in pretty much immediate death. Satan wasn't the one lying. And it was proved in the fact that Adam and Eve did not die "in the day" that they ate from the tree. Satan also didn't lie about their eyes being opened to the knowledge of good and bad, he actually showed Adam and Eve that God was withholding something from them that was for their benefit - knowing good and bad for themselves - the part of Adam and Eve that made them to be not-quite-made-in-God's-image after all.
So perhaps another, more appropriate question would be, why would God hold someone accountable for not merely "following orders" (especially dumb orders like "don't eat that fruit or I'll kill you") when they had no moral sense to begin with? Why would God try to control people whom he claimed were made in his own image with FEAR rather than give them clear REASONS for obedience and loyalty? Your husband is right about it "not being fair" - but not exactly for the reasons he feels are unfair.
Why did people have to die? Couldn't Jehovah's sovereinty be proved without them dying or suffering for that matter?
Well we are talking about Yahweh/Jehovah here. Time and again this Jealous God™ has behaved more like a petty tyrant in the Old Testament, a blood-thirsty, intolerant, genocidal maniac. This is the "god" who created man in his own image, and then decided that he wanted them to chop off the ends of their penises as a test of loyalty. This is the "god" who sent angels to Lot, and then Blessed™ him for offering his virgin daughters to a mob of men who were intent on raping them. This is the "god" who rewarded David with the throne of Israel after producing the foreskins of 200 Philistines. This is the "god" who blessed Jacob after his sons got an entire city of men to agree to be circumcised in order to enter a business arrangement with the "peace loving" sons of Israel, and then slaughtered every one of the men while they were in agony from their circumcisions. (Genesis 34) This is the "god" who turned a blind eye to the trickery of Rebekah, the wife of Isaac, who conspired with Jacob to deprive Esau of his birthright and the blessing of his blind father.
Is this really a "god" whose sovereignty you'd want to uphold, or is he just some lying blood-thirsty tyrannical pervert with a massive collection of foreskins?