Did you read the season 3 in comic books? I was surprised about the following they’ve got as I was reading that Wikipedia entry.

Not a film, but a TV series? It’s called Jericho, and the synopsis in the Wikipedia reads:

Jericho is an American post-apocalyptic action drama television series, which centers on the residents of the fictional city of Jericho, Kansas, in the aftermath of a nuclear attack on 23 major cities in the contiguous United States.

But yeah, the execution is mediocre at best. Both the action and the drama are unbearably flimsy and cliche, even the argument flops as metal.