Interesting thread.
I may only add that, when I first came here looking for answers, one of the many books I read made reference to Celsus, the pagan philosopher who was an enemy of early Christianity. He raised a similar question: if Jesus actually came back from the dead after three days, why not appear before Pilates, Herod, et cetera, so everyone found it easy to believe?
At that time, the Second Century, most of mankind hadn't even heard about Jesus or the Bible. So they hadn't shunned God, and a fair God would be the first to recognize that.
If we believe the Watchtower, then not only YHWH failed in not revealing himself through the nations. We have to believe that the Lord preferred to have the Bible written over the centuries, in different languages. Then some manuscripts were altered, some disappeared. Some other books of the way he would reveal himself to the nations were written after he had died (and supposedly resurrected). A group of men made the decision of what books would be accepted in the Canon. Let's say, because my argument doesn't need to deny it (even if I don't believe it), that God indeed led those men to pick the right books and put them into the Canon. All right. Then, more than 1800 years go by before Russell "discovers" the key to the Bible, which until then (and so far) THE OVERWHELMING MAJORITY of Christians hasn't been able to figure out, maybe because Satan gets a free pass to messing with their minds. After such discovery, Jehovah God wants the witnesses to preach door to door, which mechanism has yielded seven million members, give or take a few, after more than one hundred years.
Is it me, or does this sound like a God who is trying very hard to make it very difficult for us to finally get the point that he did come back from the dead, et cetera? Why couldn't he just appear among the clouds?
Why is it that his will needs interpreting? And, how come his will and messages were written in different languages, which are obscure to most of those "the Word" is supposed to be very interested in saving.
It's curious that Catholics claim that the Virgin Mary has appeared several times to several people (think Mexico City, Lourdes, Fatima, Medjugorje), yet they don't claim that JESUS is in the habit of revealing himself to the faithful?
So, yes, if God truly loved humans, why not reveal himself?