That is not what I said. What I said was that the powerful moved the poor, into higher density, more resource intensive areas and then neglected to provide adequate services.

If the inequality were lower and those rich people (and really I prefer powerful in this case, but they are largely the same group so I suppose it is fine) did not exist, the concentrated population would be diffused across more areas, making it less tenable to actively neglect them and making the problem less severe in the first place.

That said, I believe crime/drug use/etc are not avoidable, so its not a question of whether those things would occur but a question of the rate.