Local Authorities and schools are partly to blame, in my view. The last (virtual) inset I participated in seemed to push the view that all bad behaviour was down to trauma response.
It's practically impossible for a child to be given a temporary exclusion in the LA where I worked and there are no permanent exclusions, though a whole-school transfer is possible with parental agreement.
I recall one of my first years (Y8) telling us that a third year boy (Y10) had been advising them that you need to be bad to get treats. (Trips out, access to the Wii in the Behaviour Support Base, etc.)
The Head of Behaviour Support responded: "Oh no! You have to be good to get those treats."
S1/Y8 pupil: "Aye...but ye've got tae be bad first, haven't ye?"
Permissive parents are certainly a huge problem - the kind of parent who complains that their child is being picked on and who will claim that their child's social media was 'hacked' when he sent inappropriate pictures to younger girls.
Before I retired from my PTC (middle management) post, a parent had the temerity to phone and berate me because a young female teacher had picked up on his son's plagiarism. He wouldn't accept that it was plagiarism: "He just used the idea he got from a newspaper article."
He then informed me that he wanted to slap my teacher's face. This was a 'nice, middle-class father' in an office job. (Shouldn't matter, but people do sometimes make assumptions.)
The boy submitted a replacement piece of coursework.