I posted this in a subthread (specifically about Snopes) but I’m going to bring it out here as it outlines the evidence as I see it. If you have other points, feel free to leave them in the replies.
1) He has donated for the past five years to a candidate associated with this ideology
2) His public posts were full of references from his friends and family to his wearing something associated with this ideology, which he has been photographed doing
3) His friends and family defended him with racist and anti-Semitic insults, and he said nothing
4) Until this morning, his cover photo was of Frank Sinatra making the OK sign
5) He could have but didn’t disavow white supremacy in his explanation
6) The Jeopardy! Fan Twitter account Snopes relied on as an authority in the matter has long since said that it now believes there was nothing innocent about the gesture
7) The gesture is identical to how the three percenters perform it and not even slightly similar to how he made his 1 and 2
The reason people like him use this gesture is because other white nationalists recognize it and those who aren’t savvy to it look past it. We cannot do that.
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