The point you seem to be making doesn’t really hold up to even a light level of scrutiny.

There is not any evidence what so ever that a person who might commit a murder with a gun would just use the next available option to them such as a knife. That was something that was just introduced to the discussion as a fact when in reality it’s something you have made up.

In fact it’s immediately clear that to most people they are two very different things precisely because one of them is literally just pushing a button.

There is a reason why the murder rate is 7x higher because the access to guns requires a much lower buy in to commit the act in the first place.

Hence why people argue for stricter gun control laws. Mass access is precisely the problem.

~25% of the murders in the US are already committed without guns, so even if you removed gun crime outright and no one decided to commit the same crime with a different weapon, the US would still have ~2x the murder rate of Europe. Not that this is a case against gun control, as we're still (very theoretically) saving ~15,000 lives a year. But it does suggest that there is a cause for the differing rates that is not related to guns.

It's a lot harder to murder a large number of people with a knife than a gun.