the idiocy of sentencing.
It is frustrating to see how quickly many will be out. But there is a reason for it, as I am sure you understand. Prison authorities are interested in keeping as much order in prison as possible. Riots are not good things. The way to do that is to offer prisoners less time on a sentence in return for being of good conduct. In California, state prison sentences in most types of sentences, are cut in half IF the inmate is of good conduct during his "stay" in prison.
Many people are unaware that doing half time, or significantly less time than the full sentence, does not come automatically. Prisoners have to EARN their good conduct credits. I personally know of several inmates (and I'm sure there are a lot more I don't know about) who had to serve their full time because of infractions while in custody.