I'm not sure about this. On the one hand, it seems that it's unlikely for Earth to be the only inhabited planet. On the other hand, it seems way less likely that aliens are as "normal" as we think they might be. When people imagine aliens, they usually make them humanoid, or at least give them animal-like qualities such as two eyes, limbs, etc., but I'm not sure how likely it is that this is the case. Aliens wouldn't even have DNA. They'd be insanely different to us. They could be ten-foot high sticks of rubbery flesh that stick out of the ground, live for thousands of years and are incapable of thought (before you dismiss that idea: trees). I think that the chances of aliens existing, being sapient, developing complex societies, being technologically minded, achieving aviation, achieving space travel, finding a way to travel interstellarly, noticing that we exist and visiting us are extremely tiny.
As for the videos doodo posted, the chances of them being real are tiny and the implications are crazy. If they are real, it would mean either the Grays evolved on earth or we evolved elsewhere. I say this because there's NO way that, on two separate, independent occasions, amino acids could have reacted to form cell-like structures which then started to reproduce and gradually evolve into beings that are around 5 foot tall, have bone structures, muscles, arms, legs and digits, a torso, a head, two eyes on the front of their head and a mouth which is used to communicate with other creatures. The chances are infinitesimal to the point of being non-existent.
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