I question much of your logic:
I expected more from a Harvard student.
A couple of hours of online research should have taught him to, at least, connect through a cracked wifi far from his neighborhood. Or, if he was computer illiterate, to convince someone from another country to send the mails for him.
Also, once he decided to avoid the exam in a way that could land him in prison, why use a method he didn't understand, instead of burning down the building or paying someone to send the teacher to the hospital?
Probably because this involves actually hurting people, which goes against most people's morals. He is clearly not a sociopath, he just has really poor decision making skills. Also, both of those methods would have directly connected him to a crime through physical evidence or a witness.
However, the first question I would ask him would be if he had considered that simply approaching the teacher and explaining him that he and all his family would be killed unless the exam was postponed, carried a shorter jail time than a terrorist threat.
This approach would have resulted in loss of anonymity, FBI involvement, and once proven false resulted in the same result that he is currently experiencing.
In conclusion, clearly in Harvard they are not teaching how to deal with real world problems pragmatically.
It appears that the issue is not isolated to Harvard!