In my opinion, a civilization that has reached a level of evolution sufficient for intra-galactic travel will have also evolved spiritually, out of our current warring, paranoid, greedy, individualistic mentalities and be much more peaceful than we could understand. If they were aware of us, its likely that they would just observe our civilization with minimal interventions, if any.
A quote taken from "the mothman prophecies" movie that illustrate the difficulties of communicating with highly advanced civilizations.
Quote:
John Klein: I think we can assume that these entities are more advanced than us. Why don't they just come right out and tell us what's on their minds?
Alexander Leek: You're more advanced than a cockroach, have you ever tried explaining yourself to one of them?
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So maybe trying to contact aliens at this point is just a waste of time?