Anecdotal, but I know a couple where the father had to get a restraining order against the mother after she assaulted him repeatedly (culminating in attempted murder with a knife), and the judge insisted they split custody 50/50.
Yeah I’d speculate that most judges in US family courts are:
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conservatives that believe in “traditional” gender roles (cuz of some kind of 1950s nostalgia, reactionary stuff, etc.) or
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liberals that also believe in “traditional” gender roles (likely due to holdovers from 2nd wave feminism and/or TERF stuff).