a) No he wasn't, this is a common misconception by people who don't understand how the US court system works.
b) Aaron had a good deal, the indisputable breaking-and-entering charge would probably have gotten him more than 6 months. (Clarification: Aarons state charges were dropped to make way for the more serious federal charges, so in the end he didn't even get charged for the breaking-and-entering.)
c) Again, read up on the US court system.
You're disrespecting his memory by using him as a weapon for your misguided crusade.
Here's a good article written by Orin Kerr regarding Aarons charges http://www.volokh.com/2013/01/14/aaron-swartz-charges/