This is over politicizing the issue. This is not as simple as you make it out to be, so let me give you some of my life experiences in this area to illustrate my point and debunk yours.
Incident #1 - I was a suburban kid who had a lot of friends who lived in the inner city when I was in high school (mainly from sports) and with whom I hung out a lot with. We got pulled over (2 black kids, and me, the white kid) on Chicago's North side. My buddies had smoked a joint before they picked me up. Cop smelled the weed, asked us if we had been smoking. We all confessed we had. WHITE cop searched all of us and asked if we had any on us. My BLACK friend said he had a few joints and handed them over. WHITE cop took the weed and wrote us a ticket for expired tabs (why he pulled us over) and gave us a lecture on why drugs are bad and thanked us for being honest and not lying to him. This doesn't jive with your assertion. If it did, my black friends would've been arrested and convicted and I would've been sent on my way.
Incident #2 - I was with friends from my suburban school. There were four of us. Three white and one black guy. We were in a park sharing a joint. Cop rolls up and we don't have time to scatter. BLACK cop gets out and starts telling us we're in the park after hours. We say, "ok" and agree we should leave. Cop grabs my white friend and says he smells like weed. Cop tells us all to sit down and starts asking us questions. Who has the weed (none of us, we already smoked the joint) where the drugs were, etc. My white friend finally says we just smoked a joint and its gone and we were just talking. BLACK cop starts harassing my buddy since he recognizes him from the Varsity football team, telling him he could kicked off the team, he knows his parents etc. We all stayed cool and eventually the cop let us go without any fines and told us to stay out of the park after hours. If your assertion was correct, my BLACK friend would have been arrested and convicted of possession, but he wasn't.
Incident #3 - In college, I used to hang out a lot with the guys on the basketball team since my best friend was black and I was freshman. I was really into hip hop so the guys let me roll with them. It also didn't hurt I was from a Chicago suburb. We were in the dorm room smoking weed off of a bong, there were three players, myself and some other white guy I didn't know (I found out later he was their dealer). Get a knock at the door, go answer it and its the RA with three City Cops in tow. The RA could smell the weed, and instead of confronting us, called the cops who were now standing at our door, asking to come in. We let them in and right away he starts harassing the black guys. I'm thinking, "Ok here we go." and after grilling us about who was smoking the weed, where it was and not to lie to him, we finally confessed to smoking some weed in the bong. I handed the bong over, but the cop now wanted to know where the weed was. I had no idea who had it since I answered the door, and no one was coming forward. The cop then said he's going to call in the K-9 and whoever it alerts on is going to get arrested. The white dude says its his weed and produces a small bag with barely anything in it. RA says he's not a resident so the cop tells him was arresting him for possession and asked him several times to confirm it was his weed and he said it was. The rest of us got written up and put on probation for the rest of the quarter and were a lot more careful in the future. Again, had your assertion been accurate, my BLACK friends would have been arrested and myself and the dealer would have walked away without any trouble.
Also, its no wonder you didn't put in any actual data in your "private prison" debate:
http://en.wikipedia.org/wiki/Private_prison#In_the_United_St...
"The US Department of Justice statistics show that, as of 2013, there were 133,000 state and federal prisoners housed in privately owned prisons in the US, constituting 8.4% of the overall U.S. prison population.[12] Broken down to prison type, 19.1% of the federal prison population in the United States is housed in private prisons and 6.8% of the U.S. state prison population is housed in federal prisons"
While your assertion is true many of these companies seek profits from their endeavors, the numbers still seem relatively small in comparison to saying 80% of the prison population is still being housed by state and federal facilities. Also, compared to other countries, even prisoners in Super Max facilities have better perks than their counter parts in South America, Europe, Africa and Russia.