I attended a public school, yet I am not like any of those graduates you described above. Some Public schools might not really be doing their best in training outstanding students, but in most case it depends on the students themselves to really get that education or not. Some students are just lazy and wayward, it doesn't matter if they are in public schools or private schools. In situations like that, we don't put the blame on the school for not training the student well. We have lots of people who graduated from public schools and are doing well for themselves.  This is because,  in addition to the "small knowledge " they get from  their teachers, they are still hardworking academically. Private school graduates are not saints,  watching porn is more of a personal choice and because of the school one attended.