This is an easy one. For evangelicals, the most important issue is making abortion illegal, no exceptions. Donald Trump promised to pick Supreme Court Justices who would make abortion illegal. Consequently, all of his other failings and shortcomings can be overlooked.
Two divorces and unfaithfulness in his marriages, no problem. Never attends church and does not currently belong to a church, no problem. Uses profanity, no problem. Constantly demonstrates behavior that in any other person would be referred to as "un-Christian," no problem.
Evangelicals, in my opinion, have "sold their soul to the devil" to make abortion illegal in the U.S. again, and probably birth control too. Also, there is the added benefit of making discrimination legal and same-sex love illegal.
Evangelicals, in my opinion, are hypocrites.