Of course it's on him. He made a terrible choice and should pay for it. Again, what he did was disgusting and should be punished (I wouldn't be opposed to a 6-9mos in jail type sentence with counseling before/during/after jail), but to toss him in the clink for 3-5 years is outrageous IMO. 2 hours ago you were giving up on the kid, but now he's getting his GED, AA, and/or a Bachelor's degree. Which do you want or are you arguing just to argue?
The bold in your most recent post is exactly my point. You want to wrap the "3-5" as if it was a black and white sentence, but it's not; the bold is his real sentence. And that's where I take exception to our current process for stuff like this. These criminals get set back so far behind society that they stand almost no chance of becoming a real citizen again, so they just fall back to old habits (more times than not).
There are always exceptions to the rule like your second post I quoted - my wife's cousin did a long stint in jail for attempted murder when he was young. He managed to turn his life around and is a pretty awesome guy now, but he's told me so many stories from the other side that is really depressing to hear (tons of guys end up right back in jail). You may be getting out of jail when your sentence is over, but you're still "in jail" in a sense once you get out. The effort to recuperate these guys is poor in this country.