there’s no reason to believe that there’s such things as aliens in the universe but that it’s unlikely that they’ve been here.
Any amount of logic that you can use to justify your belief that there’s such thing as aliens can literally be applied to any amount of logic that would require saying that aliens have been to earth at some point in it’s 300 billion year existence.
Humans have a tendency to think that anything that they can’t see has not ever existed. It happens on earth and we call it xenophobia
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If aliens exist, there’s any probability that they could’ve existed for hundreds of billions of years which means it’s equally likely that they had visited earth.