Every movement has it's assholes, it's a fallacy to assume that any movement is equated with it's worst representatives. The thing is though among conservatives, I can't find any *good* representatives anymore. The last good republican president the US had was Eisenhower. Back when conservatives were still sane enough to also be social democrats.
Personally though - I don't see a way to be both a libertarian (at least in the modern/American sense) and a social-democrat/liberal/progressive. Though there are some specific policies we could agree on - they tend to be (vehemently) unwilling to form alliances with us on those issues anyway, and would rather ally against their own ideals with social conservatives (who accept their economics pseudoscience). And we tend to get completely out of sync when it comes to solving big problems individuals cannot solve themselves (like climate change - so they try to pretend it doesn't exist instead).