The vast majority of guns that end up on the street were legal at some point, they were either stolen from legal gun owners in burglaries, bought secondhand for someone who couldn't buy one legally or they were sold by LICENSED COMMERCIAL GUN DEALERS illegally.
Sooooo, somehow you think a person who wants to kill another person is honorable enough to (a) follow gun laws, (b) not purchase smuggled guns?

By your logic, laws against cocaine, marijuana, etc. don't really exist considering such high volumes exist in the US and somehow people don't smuggle/find illegal things.
Fact of the matter is, you expect honorable acts from people who have un-hononrable desires to murder which is a contradiction in itself. You also agree with people selling death to the public in mass amounts (efforts that shorten life), but yet don't want people to have
the means (whether they will have to use such or not) to defend themselves (an effort that can prolong life), another contradiction.
If the object of the game is to prolong life and ensure safety for everyone because no one chooses to be murderd, let's restrict diets (kids don't have a choice in food outside of their parents means) and food items that are sold, let's cut the selling of cars (no one chooses to be hit by anyone), let's stop the construction of swimming pools and close beaches (no one chooses to drown), let's make drinking illegal (excessive drinking can be related to innate mental illness and no one chooses to die from drunk drivers), let's make smoking illegal (people don't chose to second hand smoke in many cases), etc.
But we can read and see you are not really talking about prolonging/protecting life and safety. You are talking about a false sense of security in taking away someone's legal right.
Frankly I have no desire to touch the Constitution, because once we give the powers that be the ability to admit that one thing was wrong, we open up free reign on the whole document. Sure, fight all you want to take that 2nd amendment away, don't be surprised when the rest of them go as well.