Cat "owner" is an asshole. Like, I get that cats want to explore and decimate bird populations outside, etc... but indoor cats live longer and the situation is better for everyone if you don't let them outside unsupervised. It's the equivalent to letting your kid eat candy every night and not brush their teeth because it "makes them happy". Except in this case, it affects more than just yourself. You have to be the caretaker/parent and do what's right...
EDIT: Downvote me all you want because your feelings are hurt, but I am morally and factually right.