USMCA plugs a hole in NAFTA. It had been easy for non-NAFTA countries, particularly China, to import things into the USA via Mexico. USMCA mostly stops that. Canada isn't so alienated. The prime minister may be unhappy that his own failure was exposed, but the people got cheaper dairy. Even if Canada were alienated, it just wouldn't matter much.
It is usually best for the USA to act in a unilateral way. This is due to power. Working with multiple other parties is typically a harmful distraction. I get that some people are horrified by this, but it's clearly true, and the president's job is to put the USA first. Coalitions are for the weak.
His style is fun. There is nothing wrong with fun. It's a nice bonus, though hardly a reason to vote for the man. The same goes for getting globalist communists angry. It's a nice bonus. There are far more important reasons to support Trump.
The definition of "lie" has become absurdly biased. It's a "lie" if Trump makes a joke, exaggerates a bit, uses sarcasm, or has a few percent error on a number. Meanwhile, his opponents endlessly repeat proven falsehoods. Partisan division and anger were ramped up by his opponents, particularly in the media. There would be no division at all if people would simply accept the Trump plan for America.
We haven't had a non-narcissist president or candidate since Eisenhower, so clearly that isn't anything that matters.
You say he "is in the process of undermining confidence in the democratic process itself", as if it is his responsibility to sweep flaws under the carpet. His opponents have fought hard against anything and everything that could be used to prove fraud. (suspicious...) How can you support this situation, purposely being unaware of the extent of fraud? Unjustified confidence should be undermined. Unjustified confidence is harmful. We should not blindly trust a supposedly democratic process that would be easy to corrupt.
I'm looking back at you in disbelief. To use your wording: I would truly like to understand what could bring a reasonable, knowledgeable person to vote against Trump. (in either election) Are you in fact knowledgeable? DKIM proves corruption for both Hillary and Biden. The first time I chose Trump, I didn't trust him, but I knew that Hillary despised normal Americans and that she had committed crimes that would put any normal person in prison. I was shocked that Trump actually followed through on most campaign promises, and that earned him my enthusiastic support.