Trump is potentially dangerous, but I think he tends to talk more crazily than he acts (or will act) in practice. When you look at the details of his proposed policies they tend not to be that radical. Some are conservative and some are more middle of the road.
We have millions of illegal immigrants every year, many of them dangerous convicted felons, and yet we do almost nothing to stop it. Everyone knows that this is a problem and that we have a build a wall to make our immigration system based on law and good administrative procedure. But everyone else is afraid to do it. So for that reason he could be a good president. If immigration is reduced as a result, this would lower the unemployment rate and thus help the poor.
I don’t think he would actually ban all Muslim immigration. But reducing the numbers coming in so they can be carefully vetted would presumably happen, and there’s nothing inherently wrong or radical about reducing immigration or changing immigration policies based on valid economic or security concerns.
Anyway, the important thing is if such policies are carried out, they need to be done with moderate and reasonable explanations, not with divisive rhetoric. Hopefully Trump will change his tone if he’s elected.