Considering all of the books, movies, and television shows that have been made over the last ~80 years warning us about people like Donald Trump, it is absolutely shameful that Americans voted for him anyway (for some of them three times!).
I don't think anyone needed to be prophetic to see this coming, just reasonably knowledgeable about history. I knew he would be a disaster over 10 years ago... but I had no idea he would betray allies and threaten to invade or annex them.
Where are the guardrails? Where are the checks and balances? Americans always bragged about their Constitution, but now it appears to be toothless because he violates it with zero consequences. What is the point of an oath of office if his Presidency isn't automatically ended the instant he breaks it?
The Republican Party is cancer to the entire world, and they should never be trusted with power again... assuming you survive long enough to extract it. Every trace of them must be irradiated out of the government's body at every level or it will just return.
Whether or not Trump is using some kind of "mad man" act (doubtful) or it is true madness (more likely) is kind of irrelevant. Either way, all he is doing is destroying the United States' global reputation for a long, long time. Nobody benefits from Trump's behaviour besides him and America's enemies, which only makes sense if that was the plan all along. But Russian collusion is just a hoax, right?

Rant over... for now.