One recurring message I've noticed in old Westerns is about the dangers of gun control.
This show demonstrates that although gun control may be first instituted with good intentions, people with bad intentions can quickly use the situation for their own good.
"Laws that forbid the carrying of arms...disarm only those who are neither inclined nor determined to commit crimes...Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man." --Cesare Beccaria (Crimes and Punishment)
"One of the ordinary modes, by which tyrants accomplish their purposes without resistance, is, by disarming the people, and making it an offense to keep arms." --Joseph Story, 1840
"To disarm the people... was the best and most effectual way to enslave them." --George Mason