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I got so used to Hexbear's pocket universe that I forgot how terrible internet liberals actually are.
(hexbear.net)
I assumed it was just "hire more LGBTQIA+ prison guards!" 
It's worse than that. What I've seen recently because of federation is "(verbal performative) support for disadvantaged people as long as they maintain a successful small business in a disadvantaged area for no less than three years and aren't anywhere to the left of Bernie Sanders!"
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A liberal is someone who supports capitalism. Republicans are largely conservative liberals and fash. Dems run the gamut from conservative lib to moderate lib to progressive liberals (a social democrat) like Bernie Sanders. People on here are against capitalism and are largely marxist or anarchist of some stripe
Read up on some liberal theory, then maybe some Marxism as a treat. Doubtful you'll still call yourself a liberal
Got any good places to start?
I think the list can get very long very quickly. Yours is a good one. Engels can be easier to read than Marx and Socialism: Utopian and Scientific is great because it's short and as liberalism hasn't moved much in the 100+ years interim, it's still highly relevant even if the names have changed. Then Parenti is Parenti, what more is there to say, and Losurdo is top notch, too, although I haven't finished his book on liberalism yet.
https://redsails.org/why-marxism/