I have come to the conclusion that one cannot back Trump unless he or she is both mentally and morally deficient.
A cynical smart person would be able to see how much he lies, how often he breaks promises, and would have investigated his business and other dealings — that’s just smart self-interest. Having done so, they would realize that his ‘business acumen’ is largely PR puffery — had he merely invested all the millions he was given and loaned by his father in index stocks, it’s estimated he would be considerably wealthier. His supposed business acumen lags the market.
A person of lesser intellect and insight but with a sense of common decency might fall for his promises and lies — but would not be able to ignore his bigotry, his cruelty to the weak and different, or his toxic vulgarity.