"Just because we go around wiping out our competitors doesn’t mean aliens would do the same" This is true, but this same statement /proves/ that aliens might d

"Just because we go around wiping out our competitors doesn’t mean aliens would do the same" This is true, but this same statement /proves/ that aliens might do the same (we serve as an example) - imo that is good enough to justify a fear of alien invasion. "A civilization that has endured for millions of years would have overcome any aggressive tendencies, and may well have genetically engineered its species for harmonious living. Any truly bellicose alien species would either have wiped itself out long ago, or already taken over the galaxy." Stuff like this is pure speculation without justification - and arrogant speculation at that. At least Stephen Hawking's reasoning is minimal with the assumptions, and the assumptions he does make are on the "safe" side, i.e. assuming the worst possible risk will actually happen. e.g. aliens exists, they will be as violent as possible, they will find us etc. I'm not saying its a significant risk though...