Yossarian
⏭️
If it was this guy's job to stop a shooter in the case of something like this, I don't see what's wrong with pointing it out if he didn't do it. If the actual cops came round and hung round outside the building I'm sure people would point that out too.
In both cases, the shooting could have been averted by the nutter not having a gun, of course, so I'm not sure how it makes the gun-lovers much capital by blaming this guy.
The gun-lovers are focusing on him because their whole argument is that "good guys with guns" are the best way to prevent shootings - in this case, they're saying it happened because the guy with the gun wasn't good enough. If he'd been shot dead, they'd probably argue it was because his gun wasn't big enough.