About 50% of developers are 25-35. We skew young due to more and more people becoming programmers, that is, for the same reason that cobblers skew old, but not first vote kind of young.
And your source doesn’t even make an attempt to correlate voting behaviour to profession, much less specialised field (programmer vs gamedev), not to mention that not every gamedev is a programmer, all in all not enough data to slander a whole profession. Do better.
The reason gamedevs skews progressive, btw, is because artists do.
But OTOH yes you’re right in Poland’s case it’s not imported culture war BS it’s Catholicism.
The temporarily embarrassed millionaires don’t tend to be the ones going into gamedev: Our wages suck and being an indie is about as likely to make you rich as playing the lottery. I’d mostly limit that kind of behaviour to FAANG folks as well as people who should have studied business economics instead (or actually did) and probably can’t code for shit anyway, in short: Techbros. They’re about as toxic as your average corporate lawyer.
Assholes existing is a general feature of contemporary society, don’t pin it on people understanding “there are 10 kinds of people” jokes.