Never said parents shouldn't be on the hook for their kids well being
My biggest bitch as a parent (when my kids were younger) is that my kids see what other kids are allowed to get away with and then I have to curb the attitude my kids brought home. Now that they are teenagers I find it humorous when they come home and tell me how jacked up their friends are
When your kids can point out what other people are doing wrong, as well as avoiding those situations on their own, then you know you've done your job as a parent and given them the necessities to make it on their own.