the thing that he was sentenced for was a white collar crime with no monetary damages. If it were a white collar crime with damage done then sure, prison time might have been appropriate. 7 years seems too harsh, and was most likely the byproduct of Martin behaving like an asshole and the general public being "upset" about the drug price hike

Him being a chronic and flaming asshole throughout the whole thing makes it clear that if he isn't somehow taught a lesson, he will keep doing this stuff.

Like a lot of sociopaths, he has figured out that most people are nicer than him and he can get away with a lot of outrageous behavior because most people are simply better behaved than him, so he is unlikely to be crapped on to the degree that he is all too happy to crap on others.

Hopefully the long sentence will clue him that betting that way stops working if you push it far enough. No, you don't get to disregard social norms in how you treat others, then bank on them protecting you. Life is a two way street. Social contracts involve two parts. You don't get to endlessly abuse social norms because your wiring is outside the norm and being mean is perfectly comfortable to you.