Might well have been the case here...But this debate isn't about the likelyhood of life elswhere for whatever reasons....It's about achieving technological change one day in the future that we now look on as impossible. And in that debate time is our friend. Conversely, I see it [the debate] as an example of pessimists trying to shout down optimistic opponents not as you say. What we, you and I and everyone needs to remember is that any sense of pessimism and lack of ambition are the ultimate dangers. It's only a sense of optimism and continued forward progress can solve our current (and possible future) problems. We must find our destiny in diversity and continue forward rather than meekly await some dismal future.