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Steven Hawking posited a similar view. When we think about the big scary universe 'out there', we're kind of like primitive creatures hiding under a rock. Perhaps it would be unwise to alert strangers to our presence until we are sure of and have tested our own powers.
Then again, it's probably safe to assume any civilization capable of reaching us would not want to destroy or enslave us -- why would they need to? What power would they gain that they wouldn't already have? True that there is not necessarily a correlation between tech advancement and enlightenment, but what we're talking about here, traveling between stars, is a nearly unimaginable leap in technology. So the correlation is perhaps better posited as immense advancement in technology and lack of interest in destroying a primitive culture.