That was important in 1873. It's 2024 and modern guns have extra safety features.
Old revolvers had the firing in on the hammer and could fire if they were dropped and landed on an uncooked hammer. For most of the past century, however, the firing pin has been separate from the hammer and that kind of drop-fire is impossible.
Guy's still a dumbass, but every time someone says something so outlandishly incorrect it just gives ammunition to right-wing nut jobs who love to point out how little the other side knows about firearms.