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Originally posted by Oisin
None of you have actually thought this through have you?
Think about it, if humans came back from the future to warn us that a big plague/catastrophe/meteor whatever was going to wipe us out... They would have come back and told us. Then we would have done something abut it. And the event would never have happened.
So the situation would not occur in the future and the "aliens" would have no reason to be here. So we would never have seen them in the first place.
PS, if you think about this for more than five minutes at a time, your head will explode.