Plato,
In regards to comments about aliens out there who might know about other civilizations you write, "Wouldn't they know every possible way a new race would react when where they introduced to an other intelligent species ?"
How do you figure this? Considering the fact that people on this planet do not know how to act around other humans in other countries cities, or even neighborhoods in the same city? Do you understand all the social mores of a tribe in Africa or South America just because they are humans too? Is a handshake acceptable social contact for all humans in all communities? How can we expect that a species from across the galaxy or universe will "know" every little nuance of the species on the planet they are visiting? I don't know, unless they had some intergalactic travel guide with them.
Would the aliens be delighted to learn they were not alone? Well, maybe so, but I doubt they would be so excited that they would plop down in front of the White House, pop out of their ship, and say, "Here we are Earthlings!" as Hollywood would like us to believe. More likely, they would understand the importance of stealth, and the importance of observation from a distance. Also, assuming they have the technical ability to get to our planet, they could remain obscured for a significant period of time. They should also have the ability to witness much of what goes on on this planet. This means they could view crime, murder, war, torture, suffering just like we do on "Current Affair", albeit with the aid of video.
Now, if you went to a planet and hung in orbit for a while, and watched the denizens of the planet whack each other to death or shoot each other on the streets each day, would you still be eager to run up and shake hands with those in control? Or might you be inclined to carefully select who you made contact with?
I don't think that the aliens are out there cruising the galaxy for sentient beings, and if they are, they certainly won't find them on Earth unless they really look hard. Damn, what do we talk about when we see the posts regarding aliens on this board and others? Most people talk about the greys in a plot to take over the world (with the help of our own governments?) Next it will be jellyfish that are in a conspiracy to rule the seas. The point is that we don't live in Utopia, and neither do the aliens, and I don't think that is what they are looking for.
Your comments about flight and wormholes are beyond me. I am not sure what you are talking about. Are you suggesting that aliens appeared from a wormhole and somehow helped us with this idea of flight? I doubt that we should give them this credit, since the idea of flight has been implanted in our brains much earlier. All primitive man had to do was look at a bird, and he could grok the concept of flight. We don't need to lay that one on the aliens.