Would You Stop a Friend from Destroying the Earth?

What would you do if someone had a button that could destroy the earth and they were walking across the room to push it?  Would you stand in the way?  Would you talk them out of it?  Would you sit by and watch, maybe make a sarcastic remark or two?  What if the button might destroy the earth or might just destroy part of it?  What if it might leave most of the earth intact but kill millions of people, but what if you had no way of being sure how far the destruction would spread? 

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