The couple was arrested only after an unidentified woman bypassed the social workers who were in charge of the children's welfare and took her accusation directly to the police. Fortunately, the UK police don't try to follow the same rules of political correctness as the social services do.
A generalization is a common pattern discerned from a few examples. Liberal logic works in the opposite direction: it assumes that individual cases, such as Duke rape case and UK gay foster parents case, must obey their generalizations. Merely questioning the generalization opens one for accusations of racism or homophobia. There is a word for assuming that individual cases must obey the generalization and that word is prejudice: Political correctness is prejudice.