You underestimate the value that freedom has.
Losing your freedom sucks, no question. But he will basically be sitting in a hotel room, with the occasional foray into an exercise yard, for the next few decades.
He killed 77 people, and he won't see any real retribution.
As for the political impact of his actions...well, it's hard to say what will happen. Frankly, if he really cared that much about his cause, he would have gone after the political leaders, rather than a bunch of kids. Stupid, stupid, stupid.