Why did the original "Alien" and follow up "Aliens", films work? The back story was far fetched certainly but it had a grittiness, a sense of realism, that denied disbelief. The characters were the sort of rough hewen, mature, resourceful people, you'd expect to find on a space freighter or in the military. It made sense. Now imagine mostly soft faced types, who feel like they belong teaching on a university campus or yoga class, in the same environment. Because that's what you get with "Aliens Earth". You could say its middle class leftist Californians, facing off against horrific, alien mo...