> Imagine learning that the growth exactly resembles of actions of WWII Nazis against Jews, only now by Zionist Jews against Palestinians.
If you learn that anywhere, I think you're talking to antisemites. It's really not the same, it's not similar beyond "a state does stuff, Nazi Germany was a state, Israel is a state, so it's the same", but that's not a useful comparison.
> If you're German, you might feel especially emotional about it, given the shared history.
I'm German, I don't feel especially emotional about it, and I often do feel like that the obsession with Israel is more about "see, the Jews are doing it too, we're not so bad" and less about "what a terrible thing". Exactly because most people are very upset about Israel doing stuff and completely ignore far worse things being done by others.
As for Turkey: you don't need to go back to the Armenian Genocide. Turkey still occupies parts of Cyprus, is de-facto annexing parts of Syria and is working closely with what has been formerly known as ISIS, currently sending them to Azerbaijan to fight against Armenia.
The point is: if a vendor would say "we don't sell to Israel because of ethics" but sells to countries that are ethically far worse, their problem obviously isn't ethical in nature. Their problem would be Israel. Nevertheless, FinFisher didn't, so it's hypothetical. They probably didn't sell to Israel either, because Israel has no need to buy, having a strong security industry with lots of vendors for offensive tools.