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They have may be a very correct prediction that we are a parasite-like race in terms of spiritual advancement and do not live in harmony with our provided environment, and thus, it is best to not touch us till we learn to not kill everything we touch for our own pleasure.

There may be many reasons why an alien race does not automatically make contact, some of which are actually unknown to us. If you have difficulty swallowing the "some things can be unknown to us" thought, believe it or not, you have an ego problem.