Re: Accidental?
Surely this more favors groups opposed to firearms registration? One of the arguments some groups have against firearms licenses and requiring registration of individual firearms, is that it centralizes a great deal of personal information and increases the likelihood of theft (generally, one is best served not letting random people know both their address and that they have firearms).
I don't agree with the position I just stated (I think some degree registration has to be part of a fair compromise between the two camps, and that it is therefore the government's job to mitigate the risk by taking all reasonable steps to protect the data), but if this event is evidence for any position I would say it was that one, rather than for increased regulation.