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You’re horribly mis-using statistics and making claims that are not the logical conclusion.
We know that intelligent life exists, and that one specific, if very rare, set of circumstances can definitively bring it about. We know there are other planets that are similarly capable of supporting life. We have evidence - irrefutable, hard evidence - that such planets can, and do exist, because we live on one.
You have far worse evidence of ghosts or aliens. Having photographic proof of either is a highly sought after thing, that comes with notoriety and in some cases fame or money. Statistically, wouldn’t you say it’s more likely that, given the incentive to do so, the people claiming to produce such evidence are lying to reap the benefits? If not, again, why don’t we have actual, clear, indisputable pictures? Are you telling me that these phenomenon have been occurring throughout recorded history, but there’s not one single high quality picture? How could that be? Surely if you have enough people taking pictures, one of them by sheer chance should come out clear.
Similarly, how is it that modern astronomical or surveillance equipment hasn’t captured evidence of them? Why are we relying on shaky polaroids taken by random people? You’re cherry picking evidence that you feel has the highest likelihood of being true while discounting all of the evidence against it being true.
Nessy is purported to be a single creature living in a single Loch in Scotland; why would there be sightings elsewhere in the world? That’s like saying “The Eiffel Tower is only ever sighted in Paris, isn’t that suspicious?”
Given the relatively small number of visitors to Loch Ness vs. the number of people in the world with cameras who could presumably document aliens or ghosts, I’d argue that the sightings per visitor are at a significantly higher rate than UFO or ghost sightings.