It is a very good explanation on why they are a good that should not only be defended but promoted, and shows that it is entirely in line with Christian apostolic tradition.
In the article "US Violence Abroad Begets Violence at Home" on Ron Paul Institute, in response to the shootings in Las Vegas, Jacob G. Hornberger lays out the theory that American violence abroad begets American violence at home. This comes in 2 forms, either in terms of retaliatory terrorist attacks or in terms of violence carried out by Americans who have become desentisised to the taking of human lives.