He does come from an era where things were more open and in many ways worse, but he's also trying to tell us about things today that we pretend isn't there but it is. I'll try to keep this short, but he's more right than wrong.
http://www.prisonsucks.com/">Racial stats in our prisons
Some of the
http://www.idpi.us/resources/factsheets/mm_factsheet.htm">stats behind the stats
Quick example of what happens and why we've got a problem. Take a neighborhood which didn't start off with people much different than in any other, but they lived in a crowded area. Pass safe school zones and such and the effect turned out to be that they can overlap in places... in the suburbs a kid spends little time in one so spends little time at risk unless they do something at school. In the city they might spend most of their life in one and not even know it much of the time. Where the kid in the suburbs has options such as treatment that mandatory took the options away in the city. The 100:1 disparity, yes 100:1, between the way we sentence crack and powder cocaine didn't help any either.
That type of thing starts us off, then come the politicians and such. Someone notices that we've got way too many felonies for a small area and orders a crackdown without considering what caused the spike in felonies, so it's designated a high crime area. So now they are not only getting hit with the safe school zones but increased enforcement as well, everyone is a suspect and they start to get treated that way. Prison doesn't do good things for people so kids who went in with a bad habit come out criminals, often with gang ties since it's not easy to survive alone inside and not easy to leave them when you get out.
Now the neighborhood is being hit by two sides, the cops on one hand and the new prison gangs on the other, and eventually what used to be a decent area starts to look like too many of our streets do today.
There's a lot more to it but I'm getting tired, if anyone wants to talk about it I'll be back in a few hours but it's not a problem from the past and it's not one we've solved. It just moved behind bars and out of sight, buried under different sets of laws and justifications these days. The effects haven't changed too much though. We're still hitting people too much for where or how they live rather than the crime or injury they commit, and it's still got a sharply racist effect even if we convince ourselves the intent has changed. Intent doesn't change those results much.