You can do fun stuff if your society is totally different than ours. Like, if you live in a world that's totally vegan you can have "carnist" be a weird fringe political ideology. Or like, anti-natalists who want humanity to die not because life is suffering for humans but because humans have to consume energy of living things like plants to stay alive so then an offshoot of that can be people who want to make humans have photosynthesis.