Yeah, cuz running up to a giant robot with a sword is smart.
And you know what? Raiden got his shit rocked by a dude with a sword. Guess what? If he had a gun, all he would have had to do is shoot the motherfucker instead of letting the God Emperor of Africa die on a train to a redneck with a chainsword.
Except....Raiden clearly deflects several bullets in that video.
And in the game, people put away their guns and pull out swords when you get closer.