They can definitely misfire, but humans are more likely to misfire

When the adrenaline is pumping, it’s real easy to squeeze slightly harder… That’s why your finger shouldn’t be on the trigger until you’re ready to shoot

You want to tell me your gun shot two rounds instead of one? I can believe that. You want to tell me a cold gun, with a round in the chamber for more than 5 seconds, suddenly decided to override the required mechanical safety because you waved it around?