I don't own any firearms, but twenty five years ago I used to. One of the guns I owned was an AR-15 and I never felt the need to go out and do a mass shooting or harm another in any way shape or form.
Guns are not the issue with society.
Society is sick and the war culture of the United States is too blame. The military is always in a state of war and everyone knows the wars were and are only about money. So if your leadership is able to pass off violence as the answer to their woes then why not the troubled few.
The need for accepted violence is passed down from your corrupted and out of control leadership and those troubled few who are more susceptible to cultural narratives embrace the violence as the answer to their personal problems.
You can ban all the guns and people will just find another way to carry out their acts of violence.
To stop senseless acts of violence you must first recognize the real problems otherwise the violence will continue with other even more destructive methods.