Firstly, you are mistaken about english law regarding ward of the court status. It does not mean that the McCann's do not have custody at all. It means the courts can order things on her behalf which her parents as members of the public cannot, it also means if an abducted child is found alive they have to be returned immediately as ward of the court status means the courts have ruled she belongs to the McCann's.
The McCann's were named as aguidos, but had they withdrawn and the Portuguese attorney general stated there was no evidence they committed any crime. The PJ have stated they have ruled them out.
The British police helped bring the dogs over and arrange for the fss to test material found, the PJ mistakenly thought this was evidence against the McCann's. The Portuguese attorney general refered to this being the things they though was evidence but in the end was not.
The main witness was thought to be Jane tanner who saw a man carrying a child. Despite numerous posts accusing her of lying, and amaral stating she lied Scotland yard checked the creche records and found the man she saw proving that she did see a man matching the description she gave with a child matching the description she gave at the time and place she said. The child was not madeleine, but she always stated she never saw that it was Madeleine just a little child in pinkish pyjamas. How scotland yard proving she told the truth exposes her as a liar, I don't know. It exposes the fact the PJ never checked the creche records and amaral falsely accusing her.
Her parents have never been exposed as liars.
There are no calls for the McCann's to be charged with neglect, the Portuguese stated they did not commit neglect, and when a vigilante tried to take them to court for neglect ( not the first high profile case he's done this type of thing with) he was told it did not cone under the UK jurisdiction. The public support of the McCann's can only be highlighted by the tens of thousand they recieved last year for doing sponsored events for missing people, and that charity which relys on public donations for funding asking kate to be its ambassador. They may be some internet talk by obsessives but they are not the general public, and the general public holds them not the McCann's in contempt.