I have to agree with you here. I’ve often said that it takes more than a single sample to form a statistical basis. However, I’ve also heard others say that there may be other forms of life in the universe besides carbon-based ones like ourselves. I have to take issue with that as well. The physics are fine-tuned enough for our form of life as it is. I don’t believe other forms of life may even be possible in this universe besides hydrocarbon based ones. Silicon, maybe. But carbon chains are more stable under a greater range of temperatures than silicon ones. If there is a competition, carbon would win.
You could very well be right. But it seems to me that until we can say, “look—of the 30 different non-terrestrial lifeforms we have found so far, they were all like us and required the same parameters we do” it is just theorizing with an example of exactly one. Of course that necessarily doesn’t make it untrue either. Heck, we aren’t really sure if the same rules of physics apply the same way in all areas of the universe.
Freegards