Unfortunately, people get very confused about 'reasons' for poor behaviour and 'excuses'. It is fact that a child who comes from a terrible home is more likely to misbehave at school. That 'reason' for their behaviour is not an 'excuse'. They MUST be treated in exactly the same way as everyone else. Likewise with aspergers or ADHD children (who can come from lovely home environments). I do not discipline my aspergers child in any different way. If he steps out of line he receives the same sanction as anyone else would. He knows this - he tested me plenty of times in the first few weeks. I thought he would never get the message - but he did.