intent to kill? Most and I mean MOST people that make claims like they'd take out an active shooter would cower or blindly shoot hoping they'd hit the target. This is where and how people get themselves or others killed. Now, if you're trained for situations like this, I'm all for you engaging a target one on one. If not, just protect yourself and your family and get the fuck out of Dodge,
Having said that, if it's life or death and you have no way of hiding or exiting the situation, do what you have to to survive.