[rrbrambley]

It's a really interesting and complex topic to think about. I don't feel knowledgeable enough to make arguments one way or another, but I'd like to think that two species from different planets could happen upon each other at least by accident, in the same way that I, as a human, encounter an ant on the sidewalk. We're the most advanced on the planet; we may not care to interact with every living being on Earth, but that doesn't mean we won't step on them while moving from point A to B.