This link here I down loaded from wikileaks, it gives a detailed analysis on why it is believed the McCanns are responsible.
https://file.wikileaks.org/file/madeleine-foundation-leaflet.docContents
A. Introduction page 2
B. The 30 Key Reasons which suggest that
Madeleine was not abducted page 5
Reason 2: The evidence of the cadaver dogs pages 6-9
Reason 4: The DNA evidence pages 11-13
Reason 7: The sheer impossibility of the abduction
happening in the way it was claimed to have happened pages 14-20
Reason 9: The McCanns’ false claim that the shutters
had been jemmied open pages 21-22
Reason 15: Making long-term plans to mark
Madeleine’s alleged abduction pages 26-27
Reason 16: The constantly-changing stories of Jane Tanner pages 27-30
Reason 18: The ‘Tapas 9’s ‘Pact of Silence’ pages 31-32
Reason 21: The dubious private detective agencies
used by the McCanns pages 33-37
C. 30 other reasons which suggest that
Madeleine was not abducted page 43
Appendix 1 - A summary of evidence of British government
involvement in the case of ‘missing’ Madeleine McCann page 53
Appendix 2 - Sources of Information on the
Madeleine McCann case page 60