I'm not trying to obfuscate my own point. You have read the point I made and decided to instead purposefully ignore my point to make your own unrelated point.
There is nothing in the original advertisement you posted that even hints that the reason armed citizens are presumed to be better at taking down mass shooters is because of response times. Instead, the ad implies that both armed citizens and police are equal options for stopping the violence but that the police are just woefully inept even with their bigger guns.
The fact is that if would-be mass shooters didn't have access to assault weapons and their attendant ammo, it wouldn't matter if the citizenry was armed because there would be very few, if any mass-shooting attempts anyway. But I already said that.
This discussion is so much bickering.