I think whenever we reach such ludicrous conclusions it's more likely we have made at least one wrong assumption, if not more.

And people seem to be captivated by these memes, because the fear is great. It similar to eternal damnation in hell meme. Just look for how long it worked, and it's still working. The logic is simple, it's too dangerous to ignore such a threat, even with seemingly very small probabilities. But that still doesn't make it possible.

Logical traps founded on wrong assumptions.