Let me just say that the title, The Undercurrent, references a very nefarious idea. The idea is that whoever the Left disagrees with is evil just because they disagree. That is the undercurrent. They are racist, sexist, homophobic, etc. Then you get to misinterpret whatever they say to claim evidence of that fact. Even if they say, "white supremacists should be rejected totally" that is just evidence that they aren't aware of how racist they are. That is the undercurrent.
I reject that whole idea. People are to be judged as individuals based on their own words and deeds. Not based on your assumption of their guilt. If you are involved in claiming dog whistles and undercurrents of some sin, you are the one who is guilty of sin because you are the one slandering and lieing about their character.