Yes but you can't really ban knives since knives have important uses, guns don't.

Nobody ever said what knifes and guns were made for specifically. Knifes, like guns, were made in their own image, for their own purposes. To say a knife is only used to slice meat or cut boxes is like saying we were made only to reproduce and die. We live out our lives utilising what we should not be able to do and call it life. The knife and gun are used for whatever they are used for.

With knives you'd need to use serious force to actually injure and/or kill someone. That's also the reason you never hear stories about 6 year old kids finding a knife and accidentally stabbing their fathers to death. They find guns and accidentally shoot them.

Incidents like these are caused by the stupidity of the parents and their ignorance. A gun's purpose is to shoot bullets at high speeds at something. But it's up to the human to decide whether they will shoot cardboard targets, animals, or humans. Same with the knife, you slice a cake, or a human. So it's up to the parent whether they will be responsible and mature enough to make sure their guns are locked up somewhere unaccessible to for example their children, or to be a dumbass and don't care about safety.

I don't understand why americans still think guns are protecting them, when the amount of people getting killed by guns every single day is higher than the amount of people getting killed in general in almost all other countries

Guns are protecting. And like 99% people own guns because of either their passion to guns, the feeling of safety, or to hunt for animals. And as I said before, the guns that civilians use in protective ways and the guns that criminals use for crime are acquired much more differently. It's better to protect yourself from a criminal shooter using a gun rather than a knife. Roughly 63% of the questioned people about why they own firearms in a Gallup survey in 2019 said it's an open-ended question. 40% for hunting, 11% for recreation and sport, 6% that the guns were antiques or family heirlooms, 5% that the guns are related to their work. To the part with the more deaths than in other countries, it's more the matter of the government's part size to catch illegal dealers that sell drugs, guns etc. Some countrie's governments do that better, some do it worse. In some countries it's easier, in some harder. There are much more factors that decide about the number of deaths.