If you think abortion is okay then there is no reason you should believe forced child support is necessary.
Woman gets pregnant and doesn't want the baby but the father does? Who cares, let's abort it.
Women gets pregnant and wants the baby but the father doesn't? Let's take a percentage of his paycheck for the next 18 years of his life and throw him in jail if he refuses to pay.
Why should a man be -blam!-ed over because of what the woman wants?
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Pro-tip: You stuck it in her.