"When has I ever bothered the Roman Catholic Church when it came to murder and killing their fellow Catholics."

Not sure what you mean? Catholics, in  virtue of being civilians of different countries, subject to civil law, are drawn into conflicts, international and armed. Catholics are also members of regular armed forces, sometimes members of militia, are irregular fighters, and often make up medical and religious personnel. All 1.2 billion are in every country of the world, dealing with combatant immunity, and other combatant privileges and protections, means and methods of war, etc. Catholic pacifists, of course, have no desire to deal with these realities. Anyway, in general, all Catholics are bothered by war, specially with the use of chemical weapons, cluster munitions, incendiary devices, landmines, drones, nuclear weapons. War is inevitable -- killing, murder -- so long as nations (and Catholic noncombatants within them) are sovereign and powerful and believe they are right.