You seem to have a severe deficit of compassion. Also a deficit of strategic thinking.
Some significant fraction of those "delinquent kids" are that way due to some generational cycle of poor treatment and/or bad circumstances. If, as you advocate, little attempt is made to break those cycles, you'll just leave the problem to fester and get worse.
Also you're advocating punishing kids for being the victim of their own circumstances, which is just heartless.
The correct response to this situation is focus on finding better ways of helping those kids.