So basically, you have never met Heymann, have no idea what sort of person he is, how he behaves, how he thinks, what values drive him, etc. etc., but you are comfortable portraying him as a moral caricature and confident that there is little to no need for you to inquire further - because you're proooobably right anyway. Wonderful.
I, at least, cannot imagine
Try harder. Yeah, maybe they should have sent Aaron off for counselling. He sounds like he was becoming steadily more and more unhinged. Anyway, Aaron was pretty tenacious in his illegal behaviour at MIT. He wouldn't back down, and he got his hand slapped. That happens when you don't back off.
Aaron fits into a class of young men who believe that, because they have lofty principles which they are sure are correct, and because they are exercising their skill in a novel domain in which they are experts (computers) they are or should be above the law, and society should bend to their desires. Heymann was a critic of this trend - he wrote legal papers on it - and I assume he saw Aaron as an important case in proving a principle - that headstrong young white men with lofty ideas are subject to the same laws as the rest of us. So, his prosecution would have been primarily driven by the deterrence rationale.
Deterrence eh? Seems to be fairly well-established as a prudent rationale for prosecution in law. Lol. Nah, forget that, Heymann was an ego-driven careerist monster! Off with his head!
http://en.wikipedia.org/wiki/Deterrence_%28legal%29