Men winning custody? Surely you jest

why do the men win custody almost every fucking time they try

I know where you're getting this from. Just so you know, it comes from a deliberately misleading interpretation of "winning custody", where if a man seeks any amount of custody, and is granted anything more than nothing at all, it's 'counted' by those spreading this propaganda, a "win". This is as opposed to what any reasonable person would call a "win", which is when one gets at least as much custody as one seeks. That's like calling me a "lottery winner" because I won $5 after spending $1000 on tickets, lol.

If the mother of my child is abusive and I try to get full custody, but the judge gives me every other week supervised visitation, that is obviously not a "win", but it is, by the definition of the misandrists who propagated that particular piece of bullshit around.

Like i said, the issue varys wildly by state or court.

Although part of the reason why men who ask for custody get it more than 50% of the time is that very often they know (or believe) they don't have a chance and so don't fight.