An ET would have to be on another plane of intelligence if visiting earth from somewhere light years away. They would be traveling in a way unknown to us. (Not with blinking lights, not with any lights or colors, etc. They would not necessarily be our size. (They could be bigger than the earth or smaller than an ant.)
But believers are saying they traveled this far and were stupid enough to CRASH. (Roswell)
There may be Aliens but we probably should not worry about them. No matter what, we could not defend ourselves if they were hostile and could not understand them if they were friendly.
The best we can do is continue to make space movies based on westerns and bad guys and good guys.
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