I hear you. However, there are a lot more "Evangelicals" who don't follow that lead than you think. You just don't see them on media outlets. Guys like Russell Moore, Al Mohler, John Piper and myself. You only see the wrong-headed one's like Falwell, Vines, and Dobson and the those who mistakenly follow them. But it is frustrating how many have more allegiance to the conservative politics than they do to Jesus. AsburySkinsFan is right though about the term Evangelical. It has lost its true meaning.
Here is an article from Russell Moore in 2016 where he expresses the same sentiment. He gets lots of flack from the Trump supporters in the SBC.
https://www.washingtonpost.com/news/acts-of-faith/wp/2016/02/29/russell-moore-why-this-election-makes-me-hate-the-word-evangelical/?utm_term=.2b92d8170bfc