This goes for individuals and groups. If Jews, as a group, have a discernible pattern of behaving badly, it reflects poorly on the group. Think of football hooligans. Resentment, disgust and irritation builds into rage, then comes backlash. Historically this has been repeated. No more blaming others, take responsibility. No one else gets to pull the 'eternal victim' card when they get called out for bad behaviour. You are not special in this regard.
12 Iraqi troops, militiamen killed in multiple ISIS suicide attacks (AP)
from the article: Jewish critics who betray the struggle against anti-Semitism