Lucy61 it's because the men mess with the women's thought process.It's similar to causing brain damage in a way to a person.
They first manipulate the women in what ever way they can to distance herself from all friends,family,neighbors,acquaintances.That way she becomes solely dependant on the man for everything,for love,affection,comfort,security,friendship,attention.
Then once she is solely dependant on the man that's when they start putting them down,anything from what size they are,how they look,what they wear,how they do they're hair,how they treat the man/children,how they speak,they're education,where they grew up,they're upbringing,any mistakes they've ever made,they're job,they're family,they're friends,they're behavior,how they tidy up,anything bad that's ever happened to the women and they'll say she bought it on herself or that she deserved it in some way,everything.
So first they take away any support system they have.Secondly they make them believe that they're worthless and that no one else will ever want them and that they're doing them a favor by being with them.
Then they start Gaslighting,they make the women believe that things that are going on are either in her head or that she caused them,they'll use that excuse every single time!
A lot of behavior a man exhibits when he's committing domestic abuse/violence show the behavioural traits of a psychopath.That's an actual fact I've seen in case study's where Domestic abuse/violence were happening.