Same, when I beat someone up because I want their lunch money, people call me a thieving swine but if I stand by and do nothing when someone murders a woman a child in front of me, I get blamed for letting bad things happen.
I'm damned if I do, damned if I don't. Getting involved in things sure is hard.
I for one promise that I will never criticize the US for "letting bad things happen" by being "too isolationist."
It's just the liberal hawks who believe their own propaganda and genuinely managed to convince themselves against all evidence that US foreign policy is driven by benevolence who criticize the US for "letting bad things happen."