BurningBridges, it's difficult to know where to begin about the reasons for Hemmings' unpopularity. They include:
Constantly saying that social workers wrongly take babies into care to meet non-existent adoption targets;
Saying that experts, parents' lawyers, doctors, police and even the courts collude with them in that;
Going to court in one well-known case where he completely messed up the parents' case for them with utterly stupid allegations that their own solicitor had falsified her file in circumstances where she could have had no conceivable motive for doing so;
Alleging that a social worker had been dismissed for recommending that a child stay with her parents, then producing as 'proof' a document that showed the opposite. The document contained unredacted details of the name of the social worker concerned.
Allying himself publicly with Ian Josephs, who seriously advises people who suspect their partners of abusing their children not to tell the police of social services;
Constantly avoiding awkward questions such as why on earth people like parents' lawyers would want to take part in the conspiracy to steal children;
Producing as "proof" of alleged adoption incentives loads of meaningless statistics with no information as to where the data in those stats comes from and no proof that it is accurate;
Advising parents who are worried about child protection investigations to disappear abroad;
Advising parents who come to him for help to sack their lawyers and instead accept the services of his gophers who have no automatic right to speak in court and no realistic training;
Seriously misrepresenting relevant facts - e.g. in the Italian baby case, saying that the mother was sectioned for a mere "panic attack" and colluding with people producing rubbish such as the allegation that social services ripped the baby from her womb;
Terrifying parents into believing that they cannot safely take their children to A&E when they have accidents, thus depriving their children of essential treatment and putting them in danger of investigation for failing to get treatment.
And so on and so on. And that's before I touch on threats to and outing of MN posters.
But perhaps his worst problem is that, as an MP, he is actually in a position to do something constructive about the defects in the system - for instance, lobby for adequate funding and training for social services. But he chooses instead to carry on with his spurious campaign and to have a lovely time wandering around self-publicising and posturing.