It's because you lack vagina. Therefore, you cannot take care of children.
Of course, that's not true, but it's a popular opinion among other (usually female) parents, busy-bodies, and nosy people.
(Also, the "examples" of stupid dads on TV is WAY more about them being male, white and stupid, and not male and a bad parent. This is because we all have carte blanche to make fun of white males.)
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