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Trolleyology has interesting implications for real-world situations. Suppose there is a couple that has already decided to have two kids. The wife is pregnant with the first child, and they find out the child will have Down's syndrome. If they have that child, he will consume so many resources because of the more intensive care that he needs that they won't bother having a second child; he will have exhausted their quota of resources that they were willing to devote to children. If they abort him, then they will just start over and have their two kids and be done. What is the greater good?
Perhaps this is not really trolleyology, because trolleyology usually involved infringing someone's rights for a greater good.