IMHO - It's not a "cold war" when people are shooting.
Probably a bit more than a "police action" as well.

Whose fault is it --- probably all major players now involved.

Sometimes culture and memories of who-done-my-country-wrong make hate and revenge a source of pride.

Sometimes yes, you do need to fight. But your aim is better if your hand is not shaking with rage. And your mind is better able to judge the long-range benefits of your actions if you are not angry.