They contributed to the slaughter of Srebenica in Bosnia

You are referring to the Greek Volunteer Guard? Some allegedly had links to Greek Neo-Nazi groups including Golden Dawn, though you have to admit terming that as "Golden Dawn contributed to the slaughter at Screbrenica" is importing stronger connotations.

but I would wish that you didn't downplay the murderousness of Golden Dawn.

I didn't intend to downplay their murderousness, I wished to downplay the relevance of media reports on them. Which I think are disproportionate to their importance for non-Greeks. Also I hoped people would note the soft handed treatment anarchist/communist/anti-fa violence is given compared to the uniform condemnation of far right violence.