Well, as you say, he's not really that much of a kid. And I think filing it under "we all make mistakes" is kind of diminishing it. This isn't shoplifting candy from the corner store for kicks. I just don't think this is the sort of 'mistake' we all make or made.
.. I did far, far, far, far far, far worse when I was 15, as did a number of my hacker friends. Somehow, over time we grow up and become productive members of society despite our earlier transgressions.