Out of Pod Experience

For you guys who said Humans are bastard. Not all humans like that, even i hate them so much . There is dark and light, space is void

"Only Evil and Greater Evil exist and beyond them, in the shadows, lurks True Evil." ― Andrzej Sapkowski, The Last Wish

I think the main problem with this question is that it almost implies that "intelligence" is somehow the target of evolution. It is not. Evolution is a simple process which just happens and changes species over time by random and semi-random changes in the DNA and a selection process given by the environment.

There is no target, no final form, no grand plan or idea.

In my opinion, the main reason why we can call ourselves "intelligent" and what separates us from almost every species is simply that we can exchange ideas with gesture, voice, drawings, later scripture etc. This started a cultural evolution whereby learned behavior not simply dies with the individual or has to be acquired via the extremely slow adoption process of the biologic evolution but can be passed on to the next generation.

Maybe there are other factors as well which are important, but i think the exchange of information is probably the most important one.

Also there where parallel evolution's of "intelligent" species which showed a similar ability to exchange ideas, but we basically killed them all (Neanderthal).

And errors that result in survivability, get passed to the next generation.

That is why intelligence is an error.

Because

Actually, there is no proof that intelligent life, on a level similar to human like, have already not developed many times in earth history. Reason we dont have any proof, but it actually could be true, is that the petrified remains of intelligent creatures could be very hard to find, and obviously something what has happened, could have happened many times before. You would not find any remains on surface in forests. And if they evolved in oceans and were build like squids, you would not get much petrified remains either. The environment could have caused remains to vanish.