That kid destroyed the life of many people for quite some time. Now I can agree that this is the kind of situation where what he did VS the consequences of what he did are disproportionate, which is the issue with computer/cyber crimes in general. Some kind of punishment is required here, I think Valve did the right thing, now the Justice System...
You really can't just throw out a line like "destroyed a lot of lives" when we are talking about an essentially useless leak of a video game without further explanation.