Exoplanets and Fermi paradox: can we ever get an answer from other civilizations?

   In philosophy, the creature or object does not exist until we mention it. The existence is not black and white. It's like the grey spectrum under the drawing program.  The white is the position where we do not even mention the object. Then the scale goes to black through the levels of grey. Those levels are that we mention the object, discuss it, and then take images or other documents about it. And then the black is the fully proven evidence of the thing. The knowledge or even hypothesis makes the object exist.  So do alien civilizations exist or not? That is one of the greatest mysteries in the universe. Alien civilizations do not exist until we find evidence about their existence. But if we don't see alien civilizations or keep in contact with them daily, that doesn't make them non-existent. Civilization is real if it exists. And then it can exist 10,000 ly away from us.  That means we ever can make contact with them. Or do we? We all wait for the day when hypothetica

Until we find another civilization, we are alone. And then, we must realize that maybe we want to be alone. Aliens do not exist until we find them. Knowledge makes them exist. And when they turn into real, we cannot turn them non-existing. We are lucky because we live in the place between the spiral branch of the Milky Way. If civilization lives in a spiral branch, there are lots of cosmic objects that can hit their planet. One large asteroid can destroy that planet.  Many catastrophes modified evolution on Earth. Catastrophes are important for evolution. Without catastrophes, only a large number of descendants is necessary for species survivability. Mass extinctions and climate changes on Earth caused that species to need big brains and high-level intelligence so that they could find food.  Then the motive is needed to make the technical inventions. That means intelligence alone doesn't mean that species can create technical tools. They need motivation to make those things, that a