Well whoever it was they have done a pretty good job of hiding her.
IMO the McCanns guilty or innocent which is too big a topic, so let's shelve that have suffered the perfect storm. Almost anyone I mention this case too are horrified when they realise they were left alone in the apartment. Many here, maybe of an older generation can relate to leaving children alone as this was perhaps a more common practice in the old days, but the sympathy many may have had is all but gone when this is revealed. Also, add in their cold behaviour and lack of emotion in interviews and people jump to their own conclusions, which unfairly imo is complete amateur psychology(In fact the cold behaviour could be interpreted as bravery/guilt for what happened and be seen as a tragedy imo). Finally, add in the dogs and some are completely convinced, add to this the intense discussion in the press and on the internet and the resulting Chinese whispers, myths and jumped to conclusions and many people, which I believe is the majority in the UK and you have very little sympathy. Is very sad and unfair in many ways. On a more positive note for the McCanns lets not forget the immense support they have also received from many quarters.