I'm not PMJ but here is what I remember.
The main answer to the questions in relation to wickedness being permitted is that Jehovah is proving Satan to be a liar (in other words to prove a point). Do you accept that this is the case?
No. From what I can pull together it is not to prove Satan a liar. It is because Satan challenged Jehovah's right to rule.
If so why should Jehovah (the god of all armies) have to prove any point to someone (Satan) whose opinion shouldnt matter?
The explanation is to demonstrate once and for all Jehovah's right to rule. Man has been given time to demonstrate the ability to rule. How good of a job has he done?
Why should Jehovah have to sacrifice his son because of the actions of a so called rebellious spirit?
I believe that that sacrifice is to redeem MANKIND not Satan
Wouldnt the most loving thing to do (if this explanation has any truth in it) be to destroy Satan earlier and therefore dispense with the need for a ransom sacrifice?
As above, that sacrifice was needed to redeem mankind. It has nothing to do with Satan
When would it be loving for a father to subject his creation (children) to wickedness (as opposed to perfection) when he had a choice in the matter, just to prove a point?
Don't see your point here. Are you suggesting that God just automatically makes us perfect? For the record, Adam brought the conditions upon his offspring not God. Adam lost a perfect life. What else would equal what Adam lost?
If Jehovah was so sure of the outcome why would he even entertain Satans' challenge?
If someone makes an issue over something you have said or done, in front of others, how do you answer it? Yes God could have just wiped Satan out but would it ANSWER Satan's challenge?
Do you think Jehovah doubted his own creation in this case?
No.
You have said that God will soon destroy all wicked people...define wicked?
Wicked defined as per Bible.
Why must all non JWs be destroyed? Surely JWs are not the only good god fearing people on earth? (and to be honest most of those JWs arent either)
Who will be destroyed and who will not isn't ours to call. I'm glad it's not up to me.
You see if we believe all we are led to believe in relation to why God permits wickedness this does open up a whole spectrum of questions and not one of them has been answered by a Jehovahs Witness to any suitable degree.
I would have to disagree. The answers I was given many years ago made perfect sense then.