Yeah right. Until you encounter someone who has a large knife despite law, and who is willing to use it.
Even then, it might be, that this person is stronger than me (either mentally or physically) and he will take my gun and use it against me. If I had no gun in the first place, it can't be used against me.
Additionally, the more weapons are in people's hands, the more it takes people to care for their own security. It's not just that you have to buy and maintain your weapons (a gun has to be cleaned, oiled, ?!, a knife has to be sharpened...), you also may not sleep, drink no alcohol, take no drugs, because if you did, it might pose you into a situation, where your attacker is smarter, faster or simply awake while you're not.
Yeah and I want to live in a society where the weather is great everyday, beer is free and male-female ratio is one to ten.
I think it's all peoples duty to make the world a better place.
Weapons are things that can be produced by human beings. As long as they will be humans, you can not prevent those things to exist.
No, but with weapon control laws the probability of being attacked by a person with a weapon is far lower. The problem is, that these laws have to be implemented and enforced all around the world, to maximize their effect. It's the same thing with nuke bombs on a nation wide scale: If nations followed the pro-gun-arguments, all of them would need nuke bombs until one nation has more/better nuke bombs. Then all other nations do also need more/better nuke bombs. See where this leads?
Even without guns, people can hurt each other. The problem with weapons is, that they can lead to death or serious injury much faster. And death/some injuries are final. Even more final than a bitcoin-transaction, I think...