Read all about it:
Translation: Though Davidson's end was shocking, that a spammer would resort to violence was not. There are a lot of Eddie Davidsons out there, and Linford and other Spamhaus volunteers deal with them every day — and not without risk.
[...] Spammers [...] aren't just a nuisance. They're a cancer on society. And Linford has taken it upon himself to do something about them.
The overall tone of the article is a fair one, an accurate one. We need blacklists, and we should support blacklists, with reservations (as needed). Not a bad stance.