Looks like Hizzoner quit pouring through the statistics before discovering how many of that thirty-thousand were serious miscreants who were permanently stopped in the midst of the commission of some bad behavior.
At least, he kept the information to himself if he did come across it.
Most of them were suicides.
A plurality of the rest were scum killing scum at no net loss to society.
The remainder is divided up between scum killing decent folks and decent folks killing scum.
Firearm accidents are vanishingly small part of that number.