Of course eye hand coordination varies among the population but with proper training and practice the average citizen can safely possess and intelligently handle a handgun. You are infinitely more likely to kill yourself or others while driving your car to the grocery store. If we are going to be hunted down and executed by the mentally ill or terrorists then we need to be prepared to defend ourselves and our loved ones. It's the only reasonable action you can take. Does it make sense to just petition your government to solve them?
Id say an epidemic of mass shootings is a call to arms.
My State Constitution says this: Article XXI "The right of citizens to bear arms, in defense of themselves and the State, shall not be questioned."