It cannot be used as an excuse - everyone gets largely the same opportunities as far as free education goes. Sure, the privilaged few get even greater opportunities, I wont dispute that, but we all get the opportunity to take GCSE's and if we want to do A levels - thats totally free of charge as well.
You can't squander these opportunities but then blame everyone else. Plenty of people from poor backgrounds manage to not acheive nothing at school. Plenty of people manage to live in really bad areas and still not fail everything at school. It's about attitude.
These guys dont trash things because they have no other choice, they trash things because they WANT to, and because the ENJOY doing it.