I am not a Trump supporter, but I would throw out a few thoughts. If you are a "one issue" voter, with a strong opinion on one of these issues, then you will ignore everything else, and vote on that issue.
A strong anti-abortion voter. Trump will appoint judges to overturn Roe v Wade.
Worried about losing your guns? Trump will protect your right to carry better than the other guy.
Want federal aid for religious schools? Trump will encourage that, despite the obvious church and state issues.
Think environmental concerns destroy our economy? (Lumberjacks vs Spotted Owls, strip mines create jobs, global warming is a hoax to over-regulate industry.) Then Trump's your guy.
Hate the fact that taxes are collected by government, and then the money is given to the wrong people? Trump claims to be a tax-cutter (and for the wealthy, he is) and he won't be supporting programs for the benefit of black or brown people that you, Mr. White Guy, don't think are worth supporting.
Immigration. If you blame our ills on the high level of Hispanic and other immigrants, Trump is your anti-immigration, border wall
Psychologists speak of the appeal of the authoritarian to some people. A strong dictator is a good thing, if he's our dictator. Note how Trump cozies up to the worlds strongmen, Putin of Russia, Duarte of the Philippines, Bolsonaro of Brasil, and that bad ass in Saudi Arabia. So if you crave faith in a strong leader, Trump says he's your guy, and Joe looks a little frail. Trump will take care of you (like a Big Brother).
Finally, if you think the whole system is corrupt (and it may be!) and that a disrupter like Trump will tear it all down, and bring us to The Rapture, then once again, Trump's your guy.
I may be missing something, no doubt, and many voters are on the same side of more than one of these issues.
Problem is, the man is a con man carnival barker who will promise anyone whatever they want to hear. Remember "infrastructure?" he was going to rebuild America. Remember, he will replace Obamacare with his plan which will be better and cheaper. (Where is it? Almost three years now, and no plan.) Even The Wall (useless as it is) has been barely begun. I don't think Mexico has paid for it yet.
I give credit to Trump for one thing. He hasn't started any stupid wars like so many before him.
