Why are alien gray men bad?

According to the laws of the Black Forest, the chain of suspicion, and technology**, each race in the universe will destroy the intelligent races it discovers in order to protect itself.

The Law of the Dark Forest: The universe is a dark forest, and every civilization is a hunter with a gun, sneaking through the forest like a ghost, gently pushing away the branches that stand in the way, trying not to make a sound from his footsteps, and even breathing carefully, he must be careful, because there are hunters who sneak like him everywhere in the forest. If he discovers another life, whether it is a hunter or not, whether it is an angel or a devil, whether it is a delicate baby or a faltering old man, whether it is a fairy girl or a god-like male god, there is only one thing he can do:

Shoot them and destroy them, in this forest, others are hell, an eternal threat, and any life that reveals its existence will be quickly wiped out. This is the picture of cosmic civilization, this is the explanation of Fermi's paradox, which is the law of the dark forest of the universe.

The two individuals are suspicious of each other before they communicate: you suspect what I think, I suspect what you think, even if you know what I think, I know what you think, but you still suspect what I think of you, and I suspect how you think of my ......This suspicion will continue to circulate until there is communication, forming a chain, that is, the chain of suspicion. From the point of view of game theory, the two civilizations cannot form a common knowledge.

Technology**, the phenomenon of the rapid development of science and technology possessed by intelligent beings in a very short period of time.

The speed and acceleration of civilization progress are not necessarily the same, and weak civilizations are likely to surpass powerful civilizations in a short period of time.

The little grays are good, they have taken over the galaxy, they don't take humans seriously at all, they just want to keep what is on their territory from disappearing.

They wanted to control humanity, but have now been expelled from Earth.

Aliens once tried to control me and make me kill myself, aliens are bad things.

Because the little gray man is mentally ill.

I'm not sure, it depends on whether you believe in such an existence, you believe it is there, because the universe is so big, we humans are only a very small part, and there are many secrets of the universe that we can't explore.

This one is just a legend. His existence has not been confirmed in reality.