Space Bullets in Aliens =/= bullets in 2007 colorado
Why is this never considered in Sci Fi debating? I doubt we'd reach a stand still in advancing the effectiveness of bullets, especially since a sidearm can save a troop wih an empty rifles life (sort of did for Vasquez, and would've if Aliens hadn't been Aliens)
Either way, I'm sure we'd be able to accept Him and others being able to guns and kill aliens, but these aren't human beings. No, they're AvPR caricatures of characters and honestly it's not just "a ordinary high school pizza guy" it's a "brain deficient drooling high school pizza guy"