i never saw anybody been against migration of population out of war zone to safety.
I can't think of any comparable historical example of declaring a people's entire territory a war zone and migrating a substantial/majority of the entire population out. Can you? The reality is they'd be unlikely to ever be able/allowed to return, and as such the actual purpose of such a project would be ethnically cleansing the territory.
My guess is that many people wouldn't want to leave, but helping some people to leave also helps those who stay: fewer mouths to feed, less work for very strained medical facilities, and so on.
I can't think of any comparable historical example of declaring a people's entire territory a war zone and migrating a substantial/majority of the entire population out. Can you? The reality is they'd be unlikely to ever be able/allowed to return, and as such the actual purpose of such a project would be ethnically cleansing the territory.