Authority figures, from police departments to federal agencies, aren't known for making the wisest decisions in movies. In fact, some of them are bafflingly stupid.
No matter what metaphor you use to describe the United States' heterogeneous origins, there are nonetheless those facets of American culture that are widely regarded as uniquely (and sacredly) American. Well, guess what? They came from everywhere else.
Some characters are so bizarre, improbable, or flat-out impossible that you have to wonder how their creators ever came up with them. In a surprising amount of cases, the answer is that they didn't.
No matter how technologically advanced humans become, we'll always spend a good portion of our time pathetically flailing at nature and the various disasters it attempts to grind us down with.