"Where is the concern for the common good"?
The core issue(s) is (are), it seems: what is the common good for him and "them".   Is it "good" and/or is it "common"?
Only an imbecile would would deny that "making America great again" includes - if not stands for - a heavy measure of white privilege, authoritarian control, more money for the "movers and shakers", fear mongering, international disruption to lever US advantage at any cost, disengagement from environmental stewardship, all as, at least, means to that "good(?)".
One can be proud of "Christian" groups and/or dismayed with the bishops. This is more of a human issue before it is a faith one. Until Churches unite under the banner of common issues of human value and decency, the religious involvement will likely be more divisive than cohesive.