vivster said: [...]
I'd say the reasonable people who know that aliens exist and also know that they could have never visited earth are a tiny minority who will suffer by the hand of the two moron factions.
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I mean, it's not impossible that aliens have ever visited this planet. The chances are just ridiculously slim, not only because of the size of the universe but also because of time. There could very well be civilizations as advanced as ours or even more advanced, but we won't meet them if they existed a million years ago or if the will exist in a million years or something. We have been here only for the blink of an eye. The chances of aliens visiting us at this exact time are about the same as winning in the lottery every week for your whole life. So not impossible by definition. But just very very unlikely.
I am fully certain that there are other intelligent life forms in the universe. Maybe it's so rare that it only happens once at a time in a whole galaxy. But even if it was that rare, that would still leave billions of civilizations, even trillions over time.