I guess that is why he healed the high priest's ear after Peter hacked it off, right?
The "sword" Jesus refers to is not a sword that draws bloodshed, but rather divides the sheep from the goats..those that will convert from love (Christianity) and those that will convert through violence (Islam).
I know; just drawing a sort of paralell to provide a contrast between the goats (the terrorists who cut people's heads off) and those who truly want salvation. I don't know if those peace activists wanted to meet regular Iraqis or the terrorists, but if its the latter...then they came in vain.