Earlier quoted context omitted.
And yet, somehow, over the last 20 years the crime rate in the US has dropped tremendously. Every single one of those prisoners was convicted of some crime or another by a comparatively just court system. The underlying problem--criminality in some American cultures--is difficult and rather unique to the United States. Other rich countries are more culturally homogenous and hence suffer less criminality, though that'…
You seem to be saying that if we got rid of all the blacks and muslims we'd have far less crime. Did I misread you?
Cultural homogeneity and its effects on crime transcend race. European immigration to the US during the 19th and 20th centuries were linked to crime as well. Usually, the dominant cultures in a heterogenous society will exclude and oppress minority populations, which leads to poverty and desperation. The problem really is cultural heterogeneity, not anybody's race. Acceptance of minority populations into the greater culture solves the problem much more effectively than any kind of antagonistic separatism, that's for sure.
Plus, assuming cultural heterogeneity leads to higher crime doesn't necessarily mean it's a bad idea. I happen to think the benefits of a diverse, heterogenous society outweigh the costs. That doesn't mean the costs don't exist.
EDIT: In particular, check this link out: http://www.nationmaster.com/graph/cri_tot_cri_percap-crime-t...
There are countries with majority Muslim populations with lower-than-average crime rates--check out Turkey and Tunisia, as do countries with majority black populations--check out Zambia, Zimbabwe, and Jamaica. Obviously Islam, or blackness, isn't the problem here.