Our friend the philosopher Patrick Toner has a very interesting and highly unusual article entitled Catholics, Chesterton, and Concealed Carry. If nothing else, it should infuriate liberals, which can't be a bad thing. I leave it to you to think it through.
Now some thoughts of my own.
Suppose a Christian lives alone, without a spouse to look after and without dependents. Should he defend with deadly force against a deadly attack, in a home invasion, say, or should he let himself be slaughtered? I go back and forth on this question.
But suppose you are pater familias with a wife and children to protect. Should you respond to a deadly attack with deadly force? Absolutely. I would argue that such is not only morally permissible but morally obligatory. But then you must prepare for such an eventuality by becoming proficient with firearms. Whence it follows that you must oppose Hillary the Gun Grabber and her destructive ilk.
This is another important reason to vote for Trump. If Miss Mendacity gets in, it could well be curtains for your Second Amendment rights.