My own feeling is that many of the Trump supporters are overlooking all his faults for one chief reason....his pledge to build The Wall. The Wall must trump (no pun intended) every other issue by a big margin. Then they backtrack to say they support his lunatic stands on a variety of issues. As if Limbaugh, Hannity, and a number of other would support a candidate with his personal history and unconservative support of many issues and candidates. The Wall...that's the only thing I can why normally conservative people would back a louse like Trump.
There is another issue I see being brought up, and a valid one. That of bringing in absolutely unvetted and unvettable Muslim "refugees" willy-nilly. While it is related to the Wall in that it is a response to immigration policy which is ruinous, it plays on people's fear of terrorists on our shores.
Those acts are or appear to be 'random', (except attacking helpless groups of predominately non-Muslims), and if taken statistically, you have a far greater chance of being struck and killed by lightning than a terrorist.
Admittedly, those are both part of a larger problem that must be addressed, that of regulating the flow of people into this country, legally and especially illegally, and a problem which POTUS candidates have been supposed to solve for decades. Not since Operation Wetback (Eisenhower Administration) has this been done without just declaring the illegals 'legal'. Since 9/11, and actually before then, the spectre of terrorists from elsewhere has been present.
I have little faith that either of the two major candidates will accomplish much to deal with the problem if elected. Trump has already walked back the Wall from a physical structure to at least partly 'virtual', and in 100 years, no one will be able to lean against a virtual wall.