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Just in case we make contact with Extraterrestrials and to be able to better defend ourselves from them if some are hostile or aggressive towards humanity.
To those who constitute the majority saying that an alien civilization being able to travel to our solar system would be so advanced that we wouldn't stand a chance: I never stated WHEN we would make contact with said alien civilization. It's not like as we know IF or WHEN we'll make contact with another civilization; it could well take hundreds of years before we do. And by then we may have advanced enough technologically. So it's best if we start now and not wait until the last minute.