Guns don't kill people, people have always killed people.
Guns or nae, the killing has been done with rocks, swords, axes, bows, frying pans, knives, vegetables, poison, pieces of wood, pipes and everything imaginable since the very dawn of time.
It is intentions that kill people. Guns don't make it any easier.
In fact, guns make our society secure, because they are so heavily regulated and if you find the bullet you can see which gun it has been fired from and catch the bad guy.
Besides, governments will always have more guns than organized crime. Well, almost. And armies. That makes life harder for the scum.
Besides, gun killings are loud. It is bound to be noticed.
For example, tranquelizer/knife murders where the assailant quietly goes about his business and gets rid of the body are much harder to solve.