That's a best case scenario. What it could do is make military intervention an even easier decision. The loss of human life is a deterrent to engaging in war. If one side isn't concerned about that, wouldn't they be more inclined to go to war?
For example two men break through a security fence. A robotic patrol would seem to be much less likely to respond with deadly force than a human patrol would in that situation.
If the men were refugees or wounded soilders looking for medical care the more measured response of the robotic patrol may prevent a death and actually de-escalate conflict.
Also assume that the two men were hostile and fired on the patrol. The destruction of the mech is much less likely to provoke a political and civilian response than the death of a human and may lead to a more measured response.
My bigger concern is that a fully mechanized force may decrease the apparent cost of oppressing a civilian population.
Drone operators refer to children as “fun-size terrorists” and liken killing them to “cutting the grass before it grows too long,” said one of the operators, Michael Haas, a former senior airman in the Air Force
https://theintercept.com/2015/11/19/former-drone-operators-s...