It’s also often not clear who is the good or bad guy. As far as i know in Vietnam for example the main goal was to get rid of the colonialists. If the west had accepted that maybe north Vietnam wouldn’t have aligned with the Soviets. In addition the west also aligned with highly corrupt leaders in the south. We see the same dynamic in the Middle East. Out of short term interests we ally with highly corrupt dictatorial governments there and then we are surprised that things blow up in our face.
Size is an implicit threat, one that can never be eliminated. How exactly do you propose to eliminate the implicit threat of one animal/group of animals simply being larger than another?
Knowing that that is the policy that is implemented, and that fights are always risky, whether a fight occurs will be determined by the reward size and the predictability of the outcome.