In a couple years, Sirhan will celebrate this 50th year in prison. He'll still have time to do another ten or fifteen years. Lucky him. I wouldn't have wanted to do that kind of time but all things considered, he's had it pretty good.
I'm not a big fan of humane incarceration or rehabilitation. The French always used to do a good job of prison management and they never put away too many people who weren't guilty. I think that's an important consideration. You can't get away with that kind of brutality today, even if it is well deserved.
The Japanese probably do about as good as anybody in the developed World today with incarceration. You just sit alone in a silent, tiny, windowless room for however long your sentence is. A couple of times a day they give you a small portion of unseasoned rice and cabbage. It's pretty economical too.