@skeeter, as you know I've taken a long time to warm up to Trump, and I'm still not at the point where I'd let him take care of my dogs for the weekend. But - I do support his tweeting. It makes absolutely no difference what he does as to what the MSM will report, what other politicians will say and what "elites" will accuse him of thinking-doing-saying. It also makes no difference to the 30-40% of Americans who have accepted the consensus that Trump is a bad guy no matter what he does or doesn't say.
Tweeting gives him the opportunity to go to the other 60-70% of sane(ish) Americans who can potentially be influenced by what he tweets. He tweets stuff that looks bad at first but the reaction of his detractors make them look unhinged and hypocritical. And, repeatedly, what he tweets they reflexively mock and, somehow, they're the ones who end up looking bad because of their reaction.
Like the Quad Squad. They're not looking so good right now. Maybe it didn't make anyone like Trump any more than they did to begin with, but I think people are looking at the Quads and seeing malice and loonyness.
This Greenland thing may turn out the same way. "He's crazy, he's unhinged, he's dangerous", etc., but then it may end up looking like a fairly reasonable proposal. And, the left will have again shown themselves to be what they are.