I could imagine this as a god-sim, where by you have a pre-built location and then have to manage a budget on diaster prevention and once a disaster occurs, try and keep everything held together (a sort of tower defence game but with a twist), but as an FPS?

It seems like bad taste; if the game encourages a vigilante "every man for himself" approach to disaster survival, I can see it attracting a lot of controversey--especially after recent memories like Japan.