I am asking you to provide an actual scenario that supports your hypothetical. Describe a situation where someone defending themselves from an active shooter in a crowd actually results in more deaths than doing nothing. That is your "hypothetical," prove some actual reasoning that leads you to believe that by showing me a situation where that is going to happen.
My bet is that you can't actually come up with one because you would have to set up a situation where the shooter has already stopped shooting, and the only extra body is that of the shooter because he intended to surrender.
Well, I did, earlier in the thread. But I'll do it again.
Joe works in a cubicle farm, for an insurance company. One of his co-workers, Pete, gets fired and snaps - assaulting the office with smoke grenades and an AR15.
There's chaos all around Joe, people are screaming and running around in all directions, and he can't see anything. He see someone running down the hall towards him, and it looks like he's holding a gun, so Joe opens fire. But instead of Pete, it turns out to be Bill, the guy from accounting, carrying a stapler.
I wouldn't trust
myself in that situation, let alone any of my other co-workers.