The school where I teach is in a relatively 'poor' area for the county (Home Counties). It's traditionally been the 'dumping ground' of its town (pop 80 000) and has higher than local & national average SEN etc etc.
I've been there for 8 years and have taught, on average, 300 students per year.
I can only remember:
1 violent psychopath (expelled, then went on to commit manslaughter at 18)
1 obvious psychopath (he was expelled after violent assaults on a student & a staff member)
10 students over the years whom I would have gladly expelled if I had the power
ALL the rest are manageable, and varying degrees of intelligent, sociable, keen/desperate to please, helpful, public-spirited, supportive to each other, devoted to their families, respectful, grateful and appreciative of any time, resources, effort & commitment we give them.
I have taken groups to seven countries over the years, hosted visits from overseas to our town, frequently take them to London & generally encourage them to value themselves and prove to the people who regard all young people as trouble-makers that they are, 99% of the time wrong ...
Don't get me started on the treatment they receive in this country, though, especially from the older generation :(