[Travis McGee]

Was there ever an existentially threatening invasion that could have been stopped more easily, if stopped in time?

"Oh, the Europeans....they decided they would rather go extinct, apparently. Lost the will to procreate, then lost the will to even defend themselves."

[Ancesthntr]

“Was there ever an existentially threatening invasion that could have been stopped more easily, if stopped in time?”

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Nope. They clearly have a suicidal illness...and I am quite certain that the continent’s gross lack of faith in anything other than (quite faulty) political systems and men (or women playing men) has a lot to do with it.