The same way the Evangelical right supports a man who has cheated on all 3 of his wives and salivate over a man so versed in the bible to not understand the names of the books calling it "Two Corinthians".
Significant cognitive dissonance exists all around.
The choices we have as leaders are significantly problematic. But those who consider aborting a viable baby to be murder will stomach Trump over a Hillary Clinton who arrogantly says a 3rd trimester baby has no rights. Those who wish the borders to be secured and not opened by virtue of sanctuary cities, no wall, the abolishment of ICE, benefits and amnesty as a package deal will stomach Trump. Those who are against reparations and student loan debt forgiveness will stomach Trump. Those who are strict constructionists and trust a jurist who say's no versus one who finds a law where none exists in writing will stomach Trump.
These types of value differences preceded and will survive Trump's tenure. That is why they vote for Trump.