Well hate crime is without doubt rising, all the statistics suggest so. Against ethnic minorities, homosexuals, transgenders, disability... it's all gone right up since the referendum (40% or so I think it is). I personally would assume that is behaviour of the right, but I'll admit I can't directly prove it.
Yeah I'm not saying everyone who is supportive of the right is at fault here whatsoever. There are so many normal things that these days are stupidly considered 'right wing'. But I can see where Lammy is coming from that's all, based on the fact that the violence is shooting up, and genuinely ruining lots of lives, and some ERG rhetoric seems to support it. Though I'd stop well short of comparing the ERG to Nazi's.