Aw, heck...Earthlings are always shooting at other Earthlings, right? It's a grand old tradition here. ;-)

That's why I'd be damned careful if I was a visiting alien taking a look at planet Earth. In case of capture by the Earthlings, I think I might take along a "suicide" pill that I could down rather than be subjected to the tender mercies of the top secret inner echelons of the defence establishment and its medical personell.