> Anyone only blaming one side need to stop for a second [...]
When it comes to military coercion (wars, threats), and imperialism, it only takes one bad actor to cause problems.
When there are two sides, or three, it just means more actors willing to push around everyone else.
Albeit, they amplify each other. Their respective needs to dominate encourage each others' aggressive tendencies. And it is much easier to justify/ignore/repeat misbehaviors when there are other aggressors to point at.