Kate is a terrible person for calling the two Policemen who were first to the scene 'Tweedledum and Tweedledee' yet they called the McCann's 'praying arabs' when the McCann's were distraught in their bedroom. That's ok though.
Do you have a cite showing that the first two policemen called the McCanns 'praying arabs'? I only found these statements;
He found it notable that when they were still at the main reception, the father kneeled down, laying his head on the ground and crying, at the same time as making an expression which the witness did not understand.
http://www.mccannpjfiles.co.uk/PJ/NELSON-DA-COSTA.htmAfter the search, he noticed a situation that seemed unusual to him, when at a determined moment, the girl's parents kneeled down on the floor of their bedroom and placed their heads on the bed, crying. He did not notice any comments or expression from them, just crying. He says that at the main reception the father also knelt down, placing his head on the floor and crying. He did not hear the father say anything.
http://www.mccannpjfiles.co.uk/PJ/JOSE_ROQUE.htm