I am a foster carer (in England, not Scotland) and I sit in training sessions listening to experts talk about how behaviour is communication and you need to relate to the child not punish them etc and I always think, that's all very well while they're children, but in the adult world if they act out they will end up locked up. So actually perhaps it would be better to be a bit stricter with them while they're young.
I sent my two foster sons to the 'strict' secondary school in our town. At the open evening for prospective parents they talked about the rules the kids have to follow from day one. Some people don't like the idea of that and think it's very restrictive but that school is number one in the local league tables for GCSE results, Progress 8 scores etc. The kids know what's expected of them and what will happen if they don't tow the line. My foster kids have thrived there.
I did find that when they were younger they got away with things with certain teachers because they were in care. At 6 one of them was totally out of control at school, learning nothing, hurting others, wrecking the classroom etc yet at the same time the teacher was rewarding him by letting him win prizes and making crafts for him that he refused to do himself! It did him no favours at all and he was very unhappy that year as he didn't have secure boundaries. I was able to change his primary after that and he got a strict teacher, who he loved, and he's never had a major problem with school since.
I appreciate that my foster kids came to me in early primary and so I was able to set boundaries while they were young. So they don't roam the streets at night or go out wherever and whenever they want. But if they'd come to me as teenagers it might have been much more difficult to put those boundaries in place and they could be in a different position regarding school.
I do think that at mainstream all children should have to follow the rules and if they can't do that they should be excluded. No matter their background. Because it is not fair if one child's behaviour affects the rest of the class. But then there should be somewhere for them to go once that happens. And not somewhere where they can do what they like. I know my boys' second primary were not very happy with the primary PRU that occasionally they sent children to, as they had 8-12 weeks of doing whatever they wanted and often came back to mainstream worse behaved than when they left!