And by that logic I can conclude aikido is meant for persevering history and not self defense. Most of us do not carry the weapons of ancient japan.
A more myopic view point there could not be.
As long as people hold weapons (any and all weapons) in their hands, Aikido's techniques are valid. Whether it's a club, knife, screwdriver, pistol, rifle, stun gun, laser blaster, or sonic disrupter. If you or they are holding it, Aikido has an answer.