I guess. What do you expect? They're people just like everyone else. This isn't one of those "1,001 crimes you can commit in the morning while making orange juice" things from Reason magazine. Aaron went way out of his way to expose himself to this situation. It's possible that where you see an Internet folk hero, the DoJ sees someone bent on forcibly publishing every closed database pertaining to the public interest, laws be damned.†
Let me add something else that I think some other HN people may be familiar with:
My Confirmation sponsor is/was a criminal court judge (friend of the family). Very nice guy. Spectacularly nice guy. I babysat his kids once. I've seen him maybe twice in the past ten years, but I'd be surprised if he didn't remember the names of my kids. When I was younger, we saw him all the time. Every weekend. My dad played in the church folk group with him.
I can't remember the particulars, it may have been 4th of July firecrackers (illegal in Chicago) or it may have been shaving cream on Halloween, but either way he caught me and some friends doing something technically illegal. It was NOT. OK. I remember the legality of the incident being taken VERY. SERIOUSLY. Entirely different demeanor. I've seen the same thing with friends' cop dads.
I think people on HN don't fully appreciate the extent to which prosecutors and judges take the law seriously. They've dedicated their life to it. Our country is ruled by laws.
There are definitely times when the law is wrong, or when its diligent enforcement doesn't ultimately serve the social good. This may very well be one of them. But I think it's a very bad idea to build a worldview around the notion that the criminal justice system is going to casually look past the law. The law is a big deal.
† I don't know Aaron Swartz personally and am not asserting any of this to be true.
†† To your later edit: there's no statute against "public example making". If you don't want to be an example, avoid felonies. That's going to get me downvoted, so can we assume good faith and accept this new emoticon I just made up: :#> as shorthand for "I don't really think the person we're talking about is culpable for a felony based on the information we currently have"? :#>! :#>! :#>!