Well...we do have 5000+ planets orbiting assorted other stars across the known portions of our home galaxy listed in several catalogues nowadays. This is additional evidence we didn't have the last time this kind of thing got discussed in the US Congress, right? No guarantees that representatives of other intelligent species of life have been able to travel here for whatever combinations of reasons make sense to them, of course. This is a thing we should look at every so often as further evidence accumulates.
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If they have space travel, they probably consider us to be primitives, and don't want to interfere with our evolution.