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If they were peaceful and capable of "beaming down", I think they'd likely first try to make contact via radio waves or drones first.
Then we could (hopefully) share information, and identify potential issues.
If they were capable of getting here and "beaming down", I would assume they would be capable of getting plenty of biological samples and investigating potential threats without us even noticing long before they arrived.
Imagine cavemen meeting modern tech, and then put that to a power of N+1, where N is what you think is reasonable. That's how we would perceive a species capable of interstellar travel.
Yeah. Either aliens can't even get here because it's too far, or they have technology so advanced they can get here easily, which means the tech is so advanced they could be watching TV with us and we'd never know.
or if they developed shapeshifting aiblities to adapt easily to earths environment, kinda like resident alien, where alan tudyks alien took a little time to adapt to earth.