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Its an interesting topic and I have given it passing thought in the past.
There is a list of Pros and Cons on both sides of course. One Pro is that we hope an alien civilization may teach us some of their technology. In Stargate the TV series, the Asguard assisted us but they had ulterior motives with a common enemy. Can we even assume that another sentient life form will have morals as part of their makeup? No.
Seems to me the only information we have right now is, how would life on this planet treat us (humans) given the chance, intelligence and will?
Some of what is on this planet now will want to eat or conquer us, so it reasonable to assume something external to the planet will be the same. Many life forms here will be ambivalent. Perhaps our "visitors" will also.
Dophins are the only creature that I can think of that have exhibited help to people.
Maybe Dogs? But I think they fall into the ulterior motive group. Food!
Not many friendly animals considering the variety we have here.
So I am in the tread carefully camp.
I do wonder if the vast distances of space exist to keep us separated ?
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