Why do so many men abandon their children?

so many kids in the US grow up without fathers. there are even many adults who say they grew up without fathers. By that , the father abandoned them. Not due to a divorce or seperation. I used to think it was uncommon but now that I"ve gotten older, I realize its a much more common thing than it really was. how do so many men get away with abandoning their children? how is this even legal? are men just not designed to want to be parents?

Why do so many men abandon their children?
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