They can't find a single thing which suggests that the McCann's didn't love and take care of Madeleine. They made a bad decision to leave the children, though they checked on them, an abductor took the opportunity to take Madeleine. It was supposed to be a quiet friendly family site. The McCann's have had to bear the consequences of that night and will regret leaving the children until their dying day.
To be fair some sceptics do acknowledge that Madeleine was loved and cared for, yet those self same sceptics have no problem whatsoever imagining that Gerry was so easily and callously able to dispose of his daughter and then resume his dinner without an apparent care in the world which also doesn't make much sense IMO. IMO the only way that would have been possible was if the McCanns genuinely didn't care for or love their kids and saw them as a terrible obstacle to their own happiness and enjoyment of life and were quite relieved to be able to chuck one in the bin. This would make both parents psychopathic or suffering from some pathological personality disorder and certainly an absolute danger to their two remaining children, however as Spam has pointed out, neither of these has come to harm, nor have their parents been ostracised by their circle of friends, family, colleagues etc, which suggests either that these too are all suffering from similar personality disorders, or they are all collectively not very observant, or that the McCanns are simply masters of covering up their callous disregard for their own children and presenting a loving caring front. Whichever way you look at it, it doesn't really make any sense but people (fantasists) really want to believe the the McCanns were able to chuck their daughter away as if she was a bag of rubbish and then pretend to care enough about her to lobby not one, not two but three home secretaries to have their own crimes reviewed by the British police. Curly Wurly Cuckoo!