I scoff at his commentary because in my experience, the people who talk the most badass are the ones who are most likely to freeze when the stuff really hits the fan, training or not.
I've seen both. I understand what you're saying, but I've met a few bonafide badasses. Not a lot, but a few. They weren't all professionally trained for a job at it, either. Some were. Some weren't. Some were REALLY well trained. It's a spectrum. (Should make the "diversity" lovers happy, eh? They never seem to want to apply that to anything but skin color. Haha.) Most of them attributed as much of their survival to luck of the draw as they did to their training.
Since I've got no dog in the "badass" argument fight, (no desire here to be a badass...), Doc will either do what he says he'll do, or he'll make for a great distraction for the bad guys, so others can get away. Either way, it's a win.
Lots of bad guys are "badasses" too, until someone shoots back. Same thing. That can work to your advantage. Even the confusion they count on when they start killing works against them in reverse.
Of course these twits in Paris had their secondary plan when that happened -- which was to blow themselves up, so they'd just have done that sooner and still taken out anyone near them, once they felt threatened.
Planned attacks in a confined space with limited exits, are always a no-win scenario from the start. Anything after that can only make it better, silly comments about "circular firing squad" horse crap, notwithstanding. You have three ways out. Escape early or at an opportunity presented by the attackers not noticing, shoot/fight your way out, or play dead/comply. Each has a limit to its effectiveness.
Your chances of survival were near zero the second it started, so any options you have after that only makes it better. The ideologues do not, and probably will not, ever understand this. They're not pragmatists by nature. They fake pragmatism with comments like the "circular firing squad" stuff.
Reality is that it's pretty easy to notice who was yelling and carrying the shotgun vs some dude or gal who pulled a pocket pistol. Friendly fire has been exceedingly rare in the even more rare cases of multiple good people carrying.
It's not too difficult in this particular scenario to know who's on which dodgeball team.
I'm sure if concealed carry were more prevalent, the bad guys would change tactics to make it harder to figure it out. Police style uniforms good enough to trick the casual observer trying to not be shot, are cheap and readily available. That'll happen somewhere eventually.