Caporegime
Just for the record, many people who commit crimes put themselves right in the centre of the case, it's relatively common.
But they don't spend 9 years ensuring that Scotland Yard is utterly devoted to the case, nor do they spend millions encouraging the world's media to scrutinise them relentlessly.
Second, if they lets say accidentally killed the kid, what do they do, return to the UK with a kid missing? If they killed the kid and did nothing, it would automatically be suspicious, someone asks where the kid is and they can't answer and never sought help, instantly obviously guilty.
Nobody has shown me a theory that credibly explains how or why they killed Madeleine and successfully concealed her body.
Calling it a conspiracy theory based on those points is laughable because they are all easily explained and in fact have happened quite a lot of times.
Can you show me any case like the McCanns, in which the parents successfully killed their child, hid the body, and got away with it under 9 years of police scrutiny?