Why are they not happy with the sole conviction of Rudy Guede?

PERUGIA – In the end, they are the family left with nothing. Amanda Knox has flown home with her family to Seattle, tailed by a gaggle of reporters and photographers eager to chronicle her first days of freedom. Raffaele Sollecito was joyously reunited with his loyal family from Bari. Patrick Lumumba won 22,000 euros compensation for slander.
But the long-suffering family of Meredith Kercher are left wondering what on earth happened - to their daughter and to the evidence that originally convicted their daughter’s alleged killers.
The Kerchers put their faith in a foreign justice system that gave them an answer in December 2009 – but which has now emphatically changed its mind. The family are, as Meredith Kercher’s older brother, Lyle, said today, "back to square one". No closure. No truth. No peace.

Really, why are they "back to square one" when Guede, according the recent judgement, did everything? Why do they want more than that guilty-as-sin black African? What's wrong with them? What is right with the Knox family?

A British writer once told me that if Meredith Kercher had been a pure English girl, and not a mixed one, support for her in the UK would have been deafening. The evidence he provided for this theory was the case of Madeleine McCann. McCann's story roughly happened around the time of Kercher's. However, the noise the UK press made about McCann's case was much louder and more passionate than the noise it made for the mixed Meredith Kercher.