People will always kill other people but if they don't have fully automatic assault weapons then it becomes harder to kill people thus reducing the number of people they kill.
Automatic weapons have never been used in anything other than gang-related violence, with a few exceptions. And the gang-related violence rarely rely upon legally obtained firearms.
(One of the few exceptions actually involved a police officer.)
The NRA and other anti gun control lobbies argument that guns act as a deterrent is so obviously idiotic that anyone can see it for what it is, fear mongering and profiteering. None of these nutters going on shooting sprees are worried about dying, most kill themselves or the police kill them, not some random stranger who bought a handgun the other day at the mall.
I'm sure Kennesaw, Georgia feels that way. You see, they made it mandatory to have a firearm in your house if you live within city limits, and crime within the city has disappeared.
And you really think that concealed weapon carriers are simply people who purchase firearms at random? Many spend at least an hour a month at the range, ensuring that they and their weapon are in fit condition to handle anything that may threaten the safety of those around them.
allow a mentally ill people access to automatic weapons.
No.. no, they don't. People who have been diagnosed with mental illnesses cannot purchase firearms.
Please, educate yourself before you seek to curtail the rights of others.