Well, that's all well and good, of course a fist fight is not life threatening (normally). However if someone is breaking into your house, or robbing the store your in and is trying to cause harm to people you love, or just innocent people, and doing so with a gun, then what? In my state If someone breaks into my house, car, or attempts to rob me, it's legal for me to shoot them regardless of if there intention to kill me or not. Just because they are using a knife, or are going to beat me with a base ball bat, does not mean I can't defend myself with a gun.
If guns were prohibited here in the States, criminals will still have guns, regardless of the law, they would rarely get their guns the legal way anyhow. I don't even think it's up for debate, they will one way or another procure firearms from once source or another. Crazy people will kill regardless of owning firearms or not, they will use knives, fire, vehicles, bombs, bats, tire irons, ropes, water, their own hands. Them having a gun won't change that. My having a firearm in my possession will. In most cases it's not required to gun down an attacker, but even if one time you need to use lethal force and do not have access to it, that could be your only way to go home alive.
If there are people in the world, they will disagree, wage war, steal, fight and do any number of horrible things. Guns exist, just like nuclear weapons, they can't be unmade now, if it was not guns, it would be rocks, if not that then fists. The fact that guns do exist means that sane law abiding people must also be armed, because insane criminals are.
Firearms are not even solely used for defense, I've never needed one to defend myself once. Thank God for that, I honestly hope I never do. But it's great fun to go to the range with the shot guns and blast clay pigeons for a few hours with a group of friends. Or just go and try and improve your shooting skills with target shooting. I've had so many great times, just out shooting targets, just relaxing with friends, hunting or any number of things.
Guns are very important, they don't make you any less safe than being unarmed. Especially in a country where criminals are armed and always will be. You can sit there and watch people be shot, or end the situation your self. The Police won't help you when they are five minutes away, then your life is in your hands. I want a firearm of some sort, you want a knife or your fists? That's fine your entitled to your opinion, but I'd never want to be confronted with a situation where I was limited in my ability to defend myself, or my government made a choice for me in how I'll be defending my self. I'd rather make that decision on my own. luckily, in the USA we do own guns, they can't take them from us if we obey the law, they can't change the law to make them illegal because we have guns to defend our rights, not just our safety. There are pro's and con's to everything, more people die from drugs and cars here in the states, so I'd say they are less dangerous than most things. That's my take.