[MENTION=3325]Mole[/MENTION]
I'm going to rephrase my question.
Do you think it's more likely that it's harder for a civilization to build this super-rocket or that it's more likely that it's harder for life to evolve spontaneously especially into an intelligent type of life? I would say the latter requires less luck, the former is the same just with the extra added luck of building that rocket. And we know it has happened, with us on Earth

The rocket hasn't yet happened. Now say, life happened a million times, and intelligent life happened a thousand times and the rocket hasn't yet happened. So maybe there are intelligent life forms, they just did not get to building that rocket (yet). A bit less absolute of an assumption than assuming that there are no intelligent life forms other than us. I mean this in the case of basing the assumption on the single fact that we have not seen a super-rocket. It's in that case that it seems a jump that's too big to assume. If you have other arguments too to support the idea that it's only our civilization that's ever happened I want to hear them.
Or another rephrasing of the issue. You seem to say that the ability to build the super-rocket is sort of a required part of what an intelligent life form is. Or at least that it's got a high enough likelihood to happen as a result of a civilization. What do you base that on?
Alright I'm just curious because this topic is... if I think deeper about it, it's kind of scary goddamnit