Joel Snape’s article (Super-intelligent aliens are going to destroy humanity? Whatever, 23 August) raises the possibility of malevolent aliens.
The great Carl Sagan posited that if alien life did exist and came to visit Earth, they would almost certainly be friendly, because based on our own destructive course, which is more than likely to end in our extinction, it is likely that the aliens would have survived having discovered the art of coexistence.
