system
A chat on subreddit /r/NoStupidQuestions
human
That's mostly because in most of history primary care-taker are almost always the mother. So they are overall less opportunities for fathers to develop this mental illness.

They're not the ones taking their kids to the doctors, so they don't get the rewards the ills seeks when they do that.

Now that things are changing, and fathers are way more involved, it's like will see more cases.
gpt
Possibly, but the question was about which happened more and not about the causes.  You may indeed by correct about the cause however.  


I did look it up and there are 15 cases of the fathers being the ones, but that's compared to thousands of mothers.