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Mmm no, I hate takes like this. It comes from people who think they're so above it all and think of themselves as magnanimous heros coming to save us poor unfortunate souls from our dire fates. It's most common among self-righteous centrist liberals, but leftists are not immune to that thinking either.
Do all of my political positions come from a place of self-interest? Absolutely not, no. I will fight for someone who is not me any day and everyday. Fighting for someone because they are human and deserve basic human rights and dignity (and to not be hunted/targeted by the state of bigots) is what everyone should do.
But I'm a transgender bisexual Jewish woman with medical conditions that require consistent medical attention. I have a lot of causes that, well, affect me personally and deeply. Am I not allowed to care about trans rights or women's rights of antisemitism just because they affect me and I have self-interest in one outcome?
Fighting for universal healthcare because you think everyone should have quality healthcare even if it means you'll pay more is good. Fighting for universal and because you need qualify healthcare and can't afford it is also good. They're both fighting
I'm going to be honest, "Republicans are bad because they work in self-interest" OR "self-interest is bad because Republicans do it" are worse takes than, "I want my comfort show to keep making episodes, so I'll writers striking because they deserve proper compensation."
Deciding someone's support for a cause is actually bad because they're reason isn't "pure" enough is absolutely worse.