This is one of those cases where people really need to learn to let their anger go. I'm sure this guy thought he was smart; that he could take precautions. Maybe he even avoided all the security cameras. Maybe it was one ticket sitting in a provisioning system that said that laptop was last on his desk. No matter how well you think you've covered your tracks, in companies that big, there will be a record.
I'm reminded of the kid who sent a bomb threat via Tor to get out of something at his University. They didn't trace the message back to him. They noticed he was the only one on campus using Tor at that time.
If you want to fight injustice; talk to some reporters; blow some whistles -- that's one thing. Maybe you could even help people that way. But revenge isn't wroth it. Even if you think you can get away with it. Just take a deep breath, remember humanity will all be extinct one day and that life goes on. People who are full of hate will lead miserable lives.