In the long run it'd be a "good thing" for the survivors, but in the short term people won't just sit there while their environment grow hostile to their presen

In the long run it'd be a "good thing" for the survivors, but in the short term people won't just sit there while their environment grow hostile to their presence, and they'll try to move to a more livable environment, but those will be guarded by people already living there, with bullets and fences...