"People have seen enough of Dr Phil to work out how parental alienation works and that it's a huge problem in child socialisation/custody/visitation"
Actually I don't believe it is a huge problem at all.
I think it's a tiny, tiny problem that has been blown out of all proportion by men who as Gatorade says, are simply incapable of seeing their own behaviour the way their kids do - because they're always right, the fact that their kids think they are wrong, is not evidence that they might be wrong, or that their kids are actual people with their own opinions, it's evidence that mother is a malevolent bitch who shouldn't be allowed to have custody of her children.
Parental alienation rings all misogynists' bells because it chimes with their fear that their abuse of women and children will be noticed and rewarded with the attitudes from their children that they deserve, rather than the attitudes to which they feel they're entitled - the attitudes due to the pater familias. They invented Medea as the most extreme version of a woman who, because she has control of their children, can use them to hurt a man. She's the embodiment of why women can't be trusted with their own children and this nonsense about the so-called widespread problem of parental alienation, is just an updated modern version of that deep discomfort men have about women's care and control of children.
The media have taken it up enthusiastically and promoted it as a serious, huge problem for the same reason they take up and pretend any problem, however unusual, which women might cause men, such as false rape allegations, false DV allegations, denying contact with children unreasonably - is a huge, enormous, out of control problem - because we live in a woman-hating society and people are much more comfortable with the idea that it's more likely that a woman is a malevolent, wicked, dangerous bitch, than that a man might be an entitled abuser.
That's why Dr Phil has so much about it. That's why judges are so antsy about it. Not because it's a serious problem, but because any challenge to men's right to be abusive to women and kids and still have their kids adore them, is felt to be an outrageous attack upon their human rights.