Actually I don't think it's very nice at all.  Everyone believes that non-violence is at least usually a good idea.  The difference between doves and civilized hawks is  between rarely and never.

But whatever one thinks of nonviolence, the notion that Yiddish speakers are incapable of it, or incapable or even conceiving a word for it, is insulting.  It implies that they are less than human, as the urge to and the idea of violence is a standard part of the human condition, regardless of whether that urge/idea is actually consummated.  Just add the idea that Yiddish has no word for lust (equally absurd), and you would complete the demasculization (and hence, dehumanization) of the entire people.  

--Z