This point of view makes much more sense than the one of skeptics. However I believe that there is a huge technological barrier to interstellar and interplaneta

This point of view makes much more sense than the one of skeptics. However I believe that there is a huge technological barrier to interstellar and interplanetary travels which provides a natural protection. Overcomming this barrier implies mastering energy source and many other aspects to the point, I expect, that colonizing a planet like Christophe Columbus discovery initiated would not make any sense. A civilization would most probably build a huge vessel providing it the optimal conditions for its long term subsistance with the required mobility to avoid whatever obstacle it could meet. We, on earth, can't do that and are exposed to a collision that will be very difficult to avoid. Another reason, I beleive, is that the most important value is scientific and technologic knowledge which yields the ability to develop the capacity to defend one self and to control its own destiny. There is no need to colonize a planet or kill everybody to get this. Though I agree that there is a risk and the longer we can stay away from it, the better. The repression/inhibition (refoulement) agressively and arrogantly promoted by skeptics is the worst strategy to adopt. We should try to face it, understand it, and learn whatever we can from it. I also beleive that there is a good chance that UFOs are manifestations of ET visits.