It seems like you think that me saying that supporting an open racist promising a racist regime of persecutions and deportation of non-whites is an issue because they’ll be effective at it, but really, no, that’s absolutely bad, regardless of how effective they are.
There was a mosque burned today by Trump supporters, there’s been violence against minorities already by Trump supporters, there was a report today about Trump supporters discussing how excited they will be to be able to murder “n*ggers” again on a CB channel. Emboldening, validating, and empowering those people is a terrible and very serious thing, regardless of what Trump is actually able to accomplish.
The country does have a Congress, though one with parliamentary rules that are easily abused. A Trump win is likely to spell a GOP win if Trump wins, as well, further eroding a check. The House of Representatives is also designed by the Constitution to over-represent rural conservative districts (and has been gerrymandered into even more over-representation), and the House is currently laden with Tea Party extremists who say overtly racist things all the time and are cut from the same cloth as Trump xenophobia-wise, which is why immigration reforms never happen. You should hear the things those guys say about Muslims, ethnic profiling, and deportation. A Trump presidency would embolden them to pass even more egregious laws.
The SCOTUS is currently evenly split, and whoever wins will be immediately appointing the tie-breaking justice. Those Justices are not purely disengaged Constitutionalists, but in fact are highly partisan. There’s a currently a shortage of cooler heads to prevail among conservative Justices and the next president will have tremendous power since they’ll immediately appoint a tiebreaker in their favor.
The administrative branch isn’t a pure embodiment of power, but as we’ve seen in the past, an administration interested in harming minorities has many powers to do so, both by sins of omission and sins of commission, and it can sometimes take years to undo a bad decision by the admin. Having the SCOTUS in the pocket of the next pres. will further empower them.
Please don’t minimize the risks here, this actually is a very serious election, and the outcome if Trump wins will unquestionably cause harm to minorities, even if he isn’t allowed to harm them as much as he’d like.