First of all, I never said that he shouldn't serve his sentence. Where in the blazes did you get that from?
Also, who is ever "fully cooked"! Life is a continual learning process. We evolve cerbrally throughout our duration upon this planet. Hopefully, our evolution is a positive one and we become more understanding and forgiving as time transpires. Realizing all along that nobody is perfect and that we ourselves as individuals, have commited even the most misdemeanor of crimes against humanity itself, leave alone other animals.
Also war and the military should eventually be outlawed. It's just stupid at this point anymore since far too many enemies and allies alike now have nuclear power. I served in the US military for six years. Trust me, when I tell ya, there's much more brainwashing involved than even care to mention. This is especially so during times of warfare.
My list of possible bad things done in the past, perhaps during youth, were just examples. Of course, most boys in particular, have done something bad that they either regret introspectively speaking or they've been made to make restitution through some type of socially imposed fine or punishment.
Sometimes we mistreat other human beings worse than we would ever treat other animals. I'm almost always surprised at some PETA member who hates blacks, latinos, or gays!