@rbreich Without intending to dip into conspiracy theorizing, it might not necessarily be stupidity, per se. It is certainly ill-advised, but we have to remember that this is a man who considers himself above the rules and above the law. He clearly has impulse control issues, his degrading speech patterns suggest possible mental decline, and I don't think anyone could argue that he's been a narcissist for most of his life.
But one alternative explanation could be that he knows how to sell. What he's selling right now is hatred and victimhood to his base. "Look at how they're treating me!" is what he howls to the press and on social media every chance he gets. His base eats it up. He doesn't need to convince the entire nation, he just needs to convince the enough people in the right places to attempt another electoral win like he did in 2016.
Here's hoping the American people won't fall for it again.