As is his right. The best way to lose a source is to out them.
You get a few trolls but amongst the shit there are some genuinely informed people. The last thing I'd want to happen is those people to not feel comfortable sharing their information. I give people the benefit of the doubt until proven otherwise, as in cases like this he's acting the same way I would/do when given information.
For the record, I'm backing him in here. Think he's on the money.
What info has he given?