Also, I don't just mean they are reactionary in certain area or in their personal life (Like Aristotle was important for biology despite being an apologies for slavery)?
I mean worth looking into their thinking precisely in areas where they're reactionary.
Possible suggestions (not saying they're justified) that I expect people would put forward include:
- Carl Scmitt
- Heidegger
if you consider them reactionary, then the continental philosophers are very interesting to read. it's just a question of if you want to put in the time to understand them. Mearsheimer is an excellent international relations thinker, and I don't know if it's common knowledge but he endorsed Bernie back in 2020 lmao.
Mearsheimer is a great example of how the realists are often very correct and accurate at the superficial levels of geopolitics.