Let me rephrase the recent statements:
(1) If there existed a preponderance of evidence showing that violence
does in fact _decrease_ when people are allowed to freely contact
each other, would the proponents of totalitarianism turn into
libertarians?
(2) If there existed a preponderance of evidence showing that violence
does in fact _decrease_ when strict military curfew is imposed, and
all citizens are allowed to leave their cells and meet only under
the supervision of military personnel for productive purposes, would
the proponents of individual liberties support the military regime?
To decrease violence _and_ increase liberty, the government could legalize marijuana, MDMA and psychedelics. That would remove lots of reasons for offensive use of guns, and make people less likely to use any violence for any other reasons. Easier on the budget, too, than gun control.