To Volin's credit--if you can even call it that--I've seen no evidence that he's malicious. I think he just utterly sucks at his job, and knows that the only real value he can create is in scooping stories. In a rush to do that, he made a bunch of shortcuts and assumptions that a professional journalist really just can't take. It's a pattern with him.
So yeah, he screwed up, and yeah every day he remains employed by the Globe just demonstrates how little credibility that entire newspaper has. But whatever his failings are, they're pretty much just a microcosm of the industry as a whole. The internet killed newspaper subscriptions and classified ads, so now there's no real money in them. As a result, they pay for third-rate talent and get predictably third-rate results. That's why being the Globe's beat reporter doesn't really mean anything anymore. It's a stepping stone at best, so whoever's sitting in the office isn't the best out there. It's just some guy. Plus, in the twitter era, reporters are racing to scoop each other and knowing it could come down to minutes. So they rush their scoops, don't go through their editors, and simply don't fact-check. That's how you get stuff like this last fiasco.
Volin isn't a troll, and I don't think he's trying to be a contrarian media personality. At least not yet, he might settle into that role if he realizes that it's the only place left for him on the Boston scene (personally, I think he'd be better served heading back to some backwater, podunk city where he won't be quite so over his head). I think he just happens to have his job at an especially difficult time to have that job, and to take matters worse he's also incompetent.