And coalition is also killing civilians for political reasons, more than thousand of them a month ATM. It is obviously calculated. It's just that someone determined murdering perhaps 5-10 thousands civilians is a OK to give power over Mosul back to Iraqi government, and gave it a go.

Pretty much every single person involved in, say, the Iraq war was indeed a murderer. Most of the battles the West has engaged in since WWII were unjust and ill-founded. The people involved in those wars are murderers.