As a German, I think you should cut your colleague some slack.
There's 8 billion people in the world who aren't German. If there's one topic that Germans don't chip in on, it won't move the needle.
Whatever we as Germans say on Israel/Palestine will be taken the wrong way by someone. Critical of Israel? Still an antisemite! Supportive of Israel? Pathological guilt!
It super sucks, but I too will leave it to others to voice strong opinions in this matter. And there's no shortage of that.
I'm not sure why you think that any of this makes Germany look morally superior. I certainly don't feel that way.