So if we are all happy the "guns don't kill people, people with guns kill people", how do we prevent someone with a gun killing people?
We could educate, or we could legislate, or we could do both.
We could educate gun owners that killing people is bad, educate them to look after their weapons/use them responsibly/store them out of the way of children, all the things that responsible gun owners should do. Societal and peer pressure should be enough to prevent these gun owners from doing the wrong thing.
However, tell me one nation in the world where ALL the citizens obey the speed limit/don't drop litter/hand back their library books on time? education will not work for everyone.
So then we legislate. We bring in laws that try and prevent the bad things, but then the good responsible citizens are lumped in with the bad citizens as laws apply to everyone. So the good citizens can take it on the chin and accept that the laws are there for the minority who can't be educated in order to make the country a safer place (i.e. enforcing speed limits!), or they can immediately get umpty about a tyranical government telling them what to do.
No easy answer, unless more people start thinking about not just themselves.....