Evangelical Christianity began with a justifiable skepticism about government, but it also has a tradition of following charismatic individuals rather than synods and presbyteries.  Also, not mentioned in the article, they found Scriptural ways to justify owning and raping other humans. Supporting a thrice -married, pussy-grabbing, serial sexual assaulter mustn't seem like such a stretch.
https://www.theatlantic.com/magazine/archive/2017/05/a-match-made-in-heaven/521409/