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.
The link to the SSPX article with an interview of Bishop Fellay is this one. It would seem as though my website system does not allow these new domains as links.