That is actually how it works. It is not against international law to strike civilian areas if it cannot be avoided in order to attack military targets.
It is if the collateral damage is considered 'excessive' in comparison to the military benefits that would be gained if the strike was successful and in relation to the level of precision available.
You know, like murdering 50 civilians in a refugee camp with a guided munition to kill an enemy officer.
frustratedphagocytosis
TinyPizza