It's part of the problem, certainly.
The biggest problem, however, is that a large segment of the population makes excuses for bad behavior. The very notion of taking responsibility for one's own behavior is anathema to much of black culture in our country, and far too many guilt-ridden white people feed in to the pathology by lowering the bar for them.
It's actually a form of racism as far as I'm concerned, as the double standards being enabled are basically saying that blacks are just animals who cannot do any better. This is, of course, wrong, but since it is a politically correct racism, it prevails among all those who merely parrot but do not think.