Being condemned by society and thrown into an asylum in no way at all proves the person incorrect.
You think that Christians who have experienced God are less or more delusional than Satanists or Muslims who've done the same?
The experience is deducted to be a hallucination if most of society would rather the person be wrong than right, there's nothing more to what differentiates those in the asylum from those free to say they know what's real or not.
Aside from that, it makes a lot of sense. You see when they talk first of Antichrist, John refers to it as a group of people who deny and/or oppose Christ and who is that embraced that's group as having the right to crucify him? It was Jesus himself. The later it's hinted that Antichrist is the direct offspring of the Devil much like Jesus is to God and it's said Jesus will return after the downfall but this was written before, not after, the chronological order that later had the ghost return.
God is severely sadistic. Who made hell and the devil? Who is that says love me, tell me I'm the sexiest, smartest, most good, infallible being or I torture you eternally?
Read the Bible with the outlook that there is no good guy and it will fascinate you.