Why not? The DC laws are failures that only hurt someone like Mr. Srigley but do not impact gun violence. If they would have actually followed the courts orders from a couple of years ago rather than pretend they’re above the SCOTUS’s ruling, this wouldn’t even be an issue.
As for the incident in question, lord knows I’ve always considered a dog to be the single most likely reason for me to unholster a firearm in need; certainly not a criminal.