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You are correct. Operations on sets (even infinite) are allowed. However to be completely honest the result wouldn't be an infinite number of people but a set consisting of an infinite number of elements (people) minus the x number of ran over people (lets call it {n - x}). There are different infinities, some bigger than others so for comparison sake (like in this problem of risk vs reward) it's misleading to call both of the infinities (n and n-x) just the same infinity, for it would appear as they are qual, which they are not. Thanks for your comment. My one and only gripe was with operations on infinities.
And yes, I am aware of the silliness of arguing over an internet meme. 

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