Mori Vi-rabbi Shlita told the following myse:
In the summer of 1947, Rebbe Aharon Mi-belz [R' Aharon Kdosh Hashem] was in Bayit Ve-gan and saw a little boy with long peyos [which was uncommon in those days] and he brought him close and caressed his cheek and said with great passion that after what happened to Klal Yisrael in the Holocaust, when that rasha wanted to destroy and annhilate the Jewish people, now we see Yiddishe Kinder with Jewish simmanim.
After a few minutes the Belzer Rebbe, zchuso yagein aleinu, sent his gabbai to bring water for netilas yadaim and washed his holy hands and said that must penalize himself for saying such a thing. Only because Klal Yisrael suffered so much at the hands of that rasha we appreciate Yiddishe Kinder? אלע יידישע קנידר זענען גוט - All Jewish children are good. He was very distressed about what he had said and then told the gabbai to say with him 3 times אלע יודישע קינדר זענען גוט.