Because they are stupid.
#1 | POSTED BY 726
(For reference, those that know me know that I absolutely abhor religion and am not trying to justify them, but let's not throw the baby out with the bathwater.)
While the sub-group of stupid evangelicals is certainly a well-represented group among trump supporters, it's not quite this simple. The truth is that the net cast to catch 'evangelical trump supporters' catches many different entities; Almost all stupid evangelicals, some smart evangelicals, some religious people who are not evangelicals (because they are ultra conservative). But it also catches another type of people. People who are socially angry.
This is a much larger group than the exclusive 'evangelical group', with which is shares members. This group is harder to 'pin-down' because they don't all fit into a recognizable group.
As soon as we (the non-trump-supporters) try to categorize the trump supporters, we make our argument less true. The best thing is to attack their 'almost always false and certainly inhumane' reason for being a trump supporter, instead of trying to psychoanalyze society. IOW, just being a trump supporter is a much more serious problem than being a member of a particular religion or group.