[Sam Cree]

"Can’t ever prove there isn’t since the universe is so large we would forget what we were doing before we got more than a couple light years out, but if we stumble across some of that, then there it is. In the meantime we ought to proceed as if we are alone in this mess."

It doesn't look as if it can be proven one way or another at the moment, true (although when I was recently on jury duty, the judge advised us that guilt can be proven beyond a reasonable doubt on witness testimony alone).

As for proceeding as if we were alone, I agree insofar as thinking for ourselves and taking care of ourselves is the correct approach. OTOH, if there are alien civilizations, there is no way to know that they'll even understand us or care about us anymore than we care about insects...their becoming aware of us might not be beneficial. I vote for keeping a low profile.

[RightWhale]

I vote for keeping a low profile.

We would have to anyway since we are not capable of making much of an impression at this time. Land on Mars? As if anybody would care even if they did notice.

[Finny]

I vote for keeping a low profile.

Yep. Broadcasting signals into space trolling for response seems like a stupid thing to do. Do we think that rules of predator and prey are exclusive to us?