_**Beautiful desert locations, earnest cast, bad script**_ A captain and sergeant (Brian Krause and Melissa Brasselle) bringing home the body of their comrade from Afghanistan unwittingly unleash several camel spiders in the Southwest desert that terrorize the people. C. Thomas Howell plays the sheriff, but is unrecognizable. I’m an unabashed fan of Grade B creature features, but “Camel Spiders” (2011) is Exhibit A on how not to write a script. The movie starts with an action-packed sequence in Afghanistan (shot at Vasquez Rocks, just north of Los Angeles in the high country), but the…