At the very least it’s not a defining feature, as with the other two.

some begin life as allies of the working class, but power corrupts. it is so unbelievably rare for humans to be able to resist that corruption that it can never be relied upon. politicians betraying the will of the people isn’t just an individual failing, it’s the system working as intended

Almost all of them. There are maybe a few exceptions. I’m going to be honest, the only politician I would count as “good” is Miguel Ángel Revilla.