As others have said, it would depend on how it all went down, what their intentions were, and if our 'leaders' screwed it up.
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One of my all time favorite SciFi movies is "The Day the Earth Stood Still". i can't recall if i saw the original in our small town movie theater (when things were good parents would spring for a Saturday Matinee for us kids) when first released, or in late '50s, maybe on one of the movie shows that i watched a lot of the much older movies on, ones from '30s and '40s. But i loved it because it was the first one i recall that wasn't dismissive of the idea that a more advanced race might want to help us.
When the remake with Keanu Reeves came out i loved it too, tho it was very different i feel--less quiet talks, more action and an ominous undercurrent, that to my mind made sense as a realistic update. Times and people do change. Actually bought a boxed set that includes both for both the contrast and the special features. (Sometimes i enjoy listening to the behind the scenes creative people talking about their 'process' as much as the movie itself.)
One of my favorite scenes was the discussion beyween Klaatu and one of his people's "observers" who had in essence 'gone native' here. He argued for us to be spared, essentially saying something we talked about often in my meditation group: Being realistic you have stay aware that terrans/humans are capable of committing great atrocities, but we are also capable of great compassion and kindness. Unfortunately we have to look for the signs of the good because 'news' tends to focus on our sensationally hateful, selfish acts. Fortunately the internet gives us some tools to stay aware of them.