On one hand the Blacks fiercely defended Harry while on the other the Lupins favoured Daniel. Actually most everyone favoured Daniel, how Kingsley hadn't seen that before was a mystery. They let Daniel get away with anything he wished. And then the Potters didn't know what the hell they were doing, to stricken with guilt to do anything. Kingsley blamed them most of all if he was being honest, they should have reeled everyone in a long time ago.