Could Rep. Louie Gohmert be even more of an idiot if he worked at it?
I suspect that if Gohmert was any more of an imbecile, that he'd have his feet in a pot and he'd be watered twice a week.
For the moment, let's set aside Gohmert's babblings about how such things wouldn't happen if people were able to pray more in public. Let's instead look at the situation you'd be faced with if you were at that theater with your concealed pistol.
It's dark. The theater is packed. Some clown comes in from the front, through an emergency exit, lobs a smoke or gas grenade and begins shooting. Pandemonium ensues.
You wouldn't have known that he was wearing body armor. But you'd be trying to shoot a guy dressed head-to-toe in black gear in a very dark room. The clown had a rifle. You'd have a handgun, probably a compact 9mm or a five-shot .38 with open sights. With your heart pounding, adrenaline coursing through your system and your eyes watering from the smoke/gas grenade, you'd have to make the steadiest shot in your life. While he is shooting other people, the noise of his shots are ringing through the theater and people are screaming, dying and pushing to get the hell out of Dodge. And when he didn't go down to a couple of shots to center-of-mass, you'd have to very carefully shoot him in the face while he is trying to kill you with a far better weapon.
And all that assumes that you're maybe fifteen feet away from Asswipe, which is about as far as you probably can be and have a hope in hell of making the shot.
Having said all that, what you'd probably end up doing is hopefully distracting Asswipe long enough so some other people could escape. But for that, you'd pay with your life and probably cost the lives of people around you.
Bottom line: It would be like trying to stop a fully-involved house fire with a garden hose.
Gohmert is an idiot.