- Not having sex means no babies.

- Don't do drugs.

- Stay in your local, neighborhood school to perform as equally well as your similarly-aged peers in schools located in more affluent areas.

Well, maybe that last one not so much.

Your argument strikes me as a reason people raise in objection to mass transit: the "undesirables" might come to town. I'm actually somewhat sympathetic to your position. I live in an area of my city that, on paper, has a pretty high average household income but due to history also has a decent amount of petty crime. The answer isn't to redline those people off to somewhere else. There is a huge difference between being poor and committing crime, except that the poor tend to go to jail and the wealthy tend to pay a fine with no admittance of wrongdoing. And the latter also tend to screw over more people in one pop.

The answer is to make it socially unacceptable, in all areas, to commit crime and to demonstrate that the law and society won't tolerate it.