If you’re a republican then you’re going to vote for your guy. They see everything he does as just bullshit and bluster. “He says things to rile up the lefties but that’s just his brand.” They see the legal issues as politically motivated, or “maybe he’s a bit dirty, but all politicians are”.
I think it really is that simple. The vast majority of the population is not making a decision of whom to vote for based on their research regarding each party’s policies. They will just always vote the way they’ve always voted.