Of course violence is a crime from BLM, Nazis or even Justin Bieber fans and should be prosecuted.  A child could see that.  

However, when Nazis are parading around, preaching their violent and evil ideology and seig heiling each other, the adults in the room remember that ideology has caused unspeakable suffering and evil.  We remember our grandparents who gave their lives to combat them and that the USA stood up to evil.

There is no moral equivalence for anyone who has a shred of humanity.  Zero.  None.