I'll bet you dollars to donuts their moms don't know.
Their moms have probably been treated that way themselves, and while they probably know, can't do a darn thing about it.
This has nothing to do with the fact that these creeps were black, but a lot to do with Hollywood/LA stimulated black rap "culture," that has taken a social problem (wlefare-state black men who hate women and will not accept responsibility for their children or anything else) and made it into a cult icon to be emulated. Incidentally, most of the people profiting from this are not black.