>>519000212
Because they don't believe in morality, only utility, mainly personal utility. Sometimes they call personal utility "morality", but that's just one of their word games, it doesn't change the fact that they reject actual morality, with all its prohibitions and obligations. Asking why a leftie does something immoral is like asking why a scorpion stings. It's just in their nature.
I don't believe this could have actually caught you by surprise. If it did.....hoo boy, you have some self-reflection to do.