We know a little about the universe, and from what we can see, life exists only on our planet. We look at the life around us, and notice that every living thing is locked in an often brutal life-or-death competition to obtain the resources needed for each hour of survival. If there is life in the universe beyond our planet, it makes sense that this struggle goes on wherever life exists.
If, therefore, an extra-terrestrial civilization spent the resources needed to send "ships" into orbit around our planet, there is no chance they would have "Come in Peace, For all Mankind." Indeed, a civilization with what it took to arrive here from elsewhere would be so advanced they would see us as no more than a scrabbling hill of ants.
All the other civilizations in the universe would know what we know: that staying on a single planet means that a single extinction-level event would be the end of life as we know it. Our only insurance is to find other planets to colonize. It is as if we are fish in a cosmic ocean: We have to keep moving and finding resources in the universe or a bigger fish will eat us.
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