The people in attendance have the personal responsibility to associate themselves and their actions with movements that reflect their beliefs. "Boo hoo, I didn'

The people in attendance have the personal responsibility to associate themselves and their actions with movements that reflect their beliefs. "Boo hoo, I didn't know the KKK was racist when I joined" is not a defense that folks will treat with any sympathy. Even if it wasn't their intention, they still messed up, and that onus remains on their head. Either way you look at it, those "fine people" are not fine -- they propped up white supremacists, culminating in the brazen murder of an innocent, non-violent counter-protestor and the random assault of numerous others. Even if they didn't know, their actions contributed to that, and they are to blame as are the outspoken racists. What you are saying is, "those people had the privilege to join that march and support those sentiments because they are not threatened by what the march explicitly represents." This is an inherently racist mode of interacting with the world, because it opens avenues for racist violence and oppression, and emboldens more outspoken racists to commit atrocities. Again, intention matters little when lives are at stake. Your argument enables the banality of evil to persist.