Personally I blame the parents, and I can assure you they are more than happy to drop Billy off at school even if he gets locked in an undocumented isolation room all day because they want nothing to do with him either, leaving the teacher to become a parent as well. This is the result of poor child rearing and it has had a devastating effect on the quality of learning in public schools. If anyone should feel guilty it should be the parents, but they don't and that's the problem.
Your last comment is irrelevant to the topic and dishonest - I actually think you really don't understand the situation at all.