I'm familiar with that argument--but my suspicion is the whole "Dem cities are havens of crime" trope, is masking the true issue--in effect creating partisan polarization that distracts and outrages folks, in exchange for actual clarity, and results that shift the status quo in a more favorable direction (which, by virtue of such change not occuring, seems reasonable to conclude that said change must be imposing on some powerful interest--but what interest that could be, that wants there to be crime, I cannot fathom).

Surely this can't be the blanket cause?