The threat to life posed by Antifa violence is not close to the threat posed by right-wing terrorism; 

and historically, the KKK is the most prolifically violent terrorist group in United States history, 

while the Nazis are among the most murderous regimes in Western history. 

Folks on the right who don’t understand those who don’t see Antifa as equivalently dangerous might reflect on the body count as the reason for that viewpoint.

The threats are not close to being equivalent.