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True, but one thing's for certain: if it's not detected, one can't do anything about it. And it seems sensible to quantify the risk to then appropriately apportion resources toward risk reduction (or not, if the risk is acceptably low).
There have been a couple of creative suggestions for deflecting asteroids - I won't repeat them here - they're in online articles found easily enough. Better minds than mine will evaluate their usefulness.
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