The problem with Guantanamo is the lack of legal process, and the way some people were swept up who shouldn't have been (which mostly got resolved in 2005-2006), not that many of them aren't horrible criminals. I'd be fine with prosecuting them all in federal civilian court with fair trials.
That's what makes (made?!) America so great in the eyes of many (myself included) that have never set foot in there, i.e. the concept that anyone deserves a fair trial, based on actual evidence, and that you wouldn't be f.cked up by the judicial system during the whole process (perdon my French).
That's what happened in Aaron's case, he was f.cked up by the system, at least that's how I see the initial threat of spending 35 (or was it 50?) years in prison for something that didn't involve murdering young kids and raping them after the deed. A judicial system that depends on threats (doesn't matter if they're implicit or not) gets dangerously close to pure dictatorship.
Like OP, I'm surprised to be so upset about someone I didn't know about a few days ago, but I keep reading everything by or about him, and man ! What a loss...
http://news.ycombinator.com/item?id=4529484
the top commentator in this topic, edw519, back then wasn't that reflective. hindsight is 20/20.
Obviously Aaron Swartz impact on the internet, his relevance to this community and obvious closeness to many people explains it. But take away who he is and the circumstances are sadly far from rare. Aaron Swartz' ordeal is being relieved right as we speak in numerous places around America and the world.
It's just unfortunate that for many it took this long to empathise or understand their plight.