The fact that he's a spammer(and Google in general for that matter) shouldn't even enter into it. There's a lot of SEOs that are ex spammers. And I'd venture a guess a lot on this board.I cannot see how people can't "go for it" reading something like this. There is evil and there is good. This dude was evil, and so are many of the so called white hat seos who use this story on networks which Google employees frequent to make themselves look better.
The guy was just a fucking coward, and had a heavy substance abuse problem. The combination of them did turn him evil. But Google does not enter into this. He is evil because he killed his family. End it there.