The parent comment was not equivocating "KKK and anti-KKK", it was simply pointing out the false equivalence on that guy's T-shirt. All-caps claims that Trump, the KKK, and Fascism are equivalent is part of the problem and exacerbating tribalism.

The anti-Semitic terrorist in Powey wrote that he felt personally betrayed and furious at how friendly Trump is with Jewish people and his support for Israel. The media, and protestors, making such extreme claims aren't just misleading people who oppose bigotry, they are misleading people who support bigotry and making the conflict bigger and more confused than it otherwise would be.

Yeah, he was angry that Trump isn't far right enough for his taste, a common trope among Nazis. I'm not sure how transfer any responsibility for his crime onto the people who are protesting against right wing extremism though.

Maybe not "equally", but they are both intolerant. The groupthinks of both teams are used to mobilize violence against easy targets of their outgroups, regardless of the purported goal.

The real distinction to draw here is the matter of numbers. A counter protester is "punching up" in respect to the more numerous mob. They're not likely to get the mob to put down their pitchforks no matter how well-crafted their sign. But as this story demonstrates, their presence makes for human faces that object to the furor.