What exactly is it going to take to get people to stop committing these mass shootings?

Like the Sandy Hook, or Las Vegas.
Anti gunners scream ban them all and all will be right with the world.
Last time I looked shooting people was very illegal hows that law doing?
What really needs to happen so these horrific events don’t keep happening?
What brings these people to do these things, desperation, ideology, the quest to be infamous?
Myself I don’t really care for people, but I wish them no ill will, or harm as they go on their merry texting way.