There's nothing that Israel needs from Germany, in effect the support is little more than symbolic.

I'm not sure why you think that any of this makes Germany look morally superior. I certainly don't feel that way.

Mostly weapons and weapons components. E.g. Israel operates a number of German-built and partially gifted submarines: https://en.wikipedia.org/wiki/Dolphin-class_submarine

Also, Israel is a trade partner, which is important because the non-western countries are hesitant to trade with them. Israel is culturally integrated into certain European institutions, in part due to German support (soccer, Eurovision, other sports).

If this was conveyed more honestly, it would at least be understandable (up to some point).

I think what grates me is the dishonesty: We want to do both at the same time: A neutral mediator that advocates for the two state solution and the world's (second-)closest ally of Israel. That's like wanting to be both the coach and the referee. At some point it just becomes an insult to everyone's intelligence.

(The US does the same spiel)

It half-way is, at least by the new chancellor Merz, who praised Israel for doing our "dirty work" in bombing Iran. And he was promptly criticized by the rest of the political establishment and the press for that.

Criticized for saying the quiet part out loud. I don't see any actual opposition to the strikes, just opposition to the wording.

Well, let's face it: Nobody likes the current Iranian government, and nobody wants yet another state (especially with a leadership like that) to have nukes. Just that nobody dares to do anything beyond sending strongly worded letters and time-wasting "diplomatic initiatives".