I never heard of Poe's Law until now.

I have watched YouTubers successfully make psychological inroads with people who support the current administration by saying things like "Trump either meant what he said or he's a demagogue. We'll see how it turns out."

Or by acknowledging their belief that Trump is a successful business man, but by including the truth right after it. I'll say "Yeah he's definitely a very successful businessman, which is why it's so surprising that he managed to wipe 5 trillion dollars worth of value from the stock market, which has hurt a ton of people."

This is exactly how propaganda works. A lie and then truth, or truth and then a lie. It's amazingly effective.