You are truly stupid (meaning unable to learn) if you think more than 13 people want to confiscate weapons.
Americans want to keep guns out of the hands of crazies.
I personally know far more thsn a bakers dozen of people who want all firearms confiscated.
But to your point... How are you going to get the guns out of the hands of current gun owners who are deemed "crazy" by whatever criteria end up being agreed upon?
The issue is not to get guns out of hands current gun owners who are deemed "crazy" by whatever criteria end up being agreed upon...the issue is to get the "current gun owners who are deemed "crazy" by whatever criteria end up being agreed upon" into institutions where they can get treatment and the help they need to get back to full mental health.