A holocaust is a holocaust, and a war is a war. Cutting off water, food, and telling people to leave while you bomb the exits is a holocaust, not war. Use the right terminology, please.
Would the US/Germany/etc. let all 2 million be killed?
Just hypothetical question - 800k deaths for Leningrad for reference. Is that the kind of threat being made?
There are civilian casualties at war. That is unavoidable. I know that even among the group of terrorists many were captured alive and one was even treated in an Israeli hospital. A mob wanted to lynch him (they were stopped) but they will be treated in military hospitals from now on.
I think the bombings are terrible. But it's very probable that we'll see a lot more die when the army comes in. Hopefully, civilian casualties will be low.