The Korean Conflict was never ended.
The US and South Korea beat the North all the way back to nearly the Chinese border, that is why China stepped in, they feared we were coming on over the river into China. In other words we should have stopped sooner and never gotten so close to thye border. NK didn't beat squat it was the Chinese + NK that ran us back down to the present DMZ.
The UN isn't worth 2 cents in this or any other conflict. The UN should be disbanded, there are far too many crazies in it to accomplish anything.
As for the civilians in NK. It will be sad but if we had fought Hitler or Japan in WWII like we are trying to fight presently, well we would all be speaking German and Japanese. Do you think NK will care about civilians in SK? No they don't even care about their own.