Well, I think some thought went into it. Obviously when they wrote this, people looked at the case law of Morales and Pearson, and they looked at the charter, because it would be hard to imagine a more targeted set of offences that lay waste to a community than firearm crimes in urban areas in the hands of people who shouldn't possess those firearms.
I'm with the previous speaker on this--and I don't want to diminish it--but more so than the local pot dealer. It intuitively makes sense that we want to target people who possess firearms and use firearms in the commission of serious crimes.