I doubt there will ever be complete data on the number of crimes prevented with guns due to the fact that they are usually not reported. The assailant surely isn’t going to report having a gun pulled on them, and the intended victim has better things to do than wait half hour or more for a cop to show up, then waste a couple hours answering stupid questions. I’ve personally had two instances that went unreported, scumbag ran off, I went on my way.
I'm assuming that these were after you deployed hardware and showed them a reason to start running?