Just follow this 6 step process to win any argument against someone who believes a retalitory attack will just breed more violence:
Step 1) Go to your local college where people are protesting against using miitary force.
Step 2) Go up to one of the protesters and politely ask them why they feel military action is wrong.
Step 3) Wait until they begin to explain that military action would just mean more people getting hurt, and proceed to punch them in the face.
Step 4) When they get up, politely explain to them that any retaliation would be against their principles, and would be considered wrong.
Step 5) While they ponder this, punch them in the face again.
Step 6) Repeat steps 4-6
Step 1) Go to your local college where people are protesting against using miitary force.
Step 2) Go up to one of the protesters and politely ask them why they feel military action is wrong.
Step 3) Wait until they begin to explain that military action would just mean more people getting hurt, and proceed to punch them in the face.
Step 4) When they get up, politely explain to them that any retaliation would be against their principles, and would be considered wrong.
Step 5) While they ponder this, punch them in the face again.
Step 6) Repeat steps 4-6