An alternative consideration could be: a convicted child molester/paraphile, burgling but deciding to take a child instead. In this case, a female child. The BKA’s five charges against CB, involve women only. Ranging from +/- 15 to 70 years old.
The holiday resort and nearby, obviously had a long history of criminality much of which was allowed to run unchecked.
Check out the dates on the following ~
Madeleine McCann police seek intruder who attacked girls at holiday homesJames Meikle
Wed 19 Mar 2014 21.03 GMT
Police investigating the disappearance of Madeleine McCann from a Portuguese holiday resort nearly seven years ago say a lone intruder sexually assaulted five girls aged between seven and 10 in the Algarve between 2004 and 2006.
The four incidents – one involving two girls – were among 12 over six years up to 2010 being examined by officers in which a man entered holiday accommodation, mainly villas occupied by British families.
https://www.theguardian.com/uk-news/2014/mar/19/madeleine-mccann-police-intruder-girls-algarveMadeleine: Portuguese police to re-examine burglaries at resortBy FIONA BARTON
Last updated at 11:48 19 August 2007
The under-fire Portuguese police are preparing to take a fresh look at reports of two earlier break-ins in the apartment block where Madeleine McCann and her family stayed.
Both burglaries - one in the apartment directly above the McCann's flat - are understood to have happened two weeks before the family of five arrived at the Mark Warner Ocean Club in Praia da Luz.
One was believed to have been committed by someone with a key to the burgled apartment.
https://www.dailymail.co.uk/news/article-476064/Madeleine-Portuguese-police-examine-burglaries-resort.htmlSerious crimes were being committed. Yet there seems to have been a dearth of any sort of meaningful search by the Portuguese police for forensic evidence of any kind. To the extent of allowing Madeleine's bedclothes to be removed by the cleaners.
There is little evidence (if any) that there was any serious thought given to the chance that these offences could have been linked either to the same perpetrator or group until Scotland Yard took over the investigation and began working through the case systematically.
Madeleine McCann Update: British Police Want To Interview Three Alleged BurglarsJan 13, 2014,
Authorities in the UK are traveling to Portugal this week to interview three men in connection with the disappearance of Madeleine McCann.
The three men Metropolitan Police want to interview committed burglaries at the Portuguese resort the British girl vanished from, according to The Daily Mirror.
Cellphone records also allegedly show the three men made numerous calls to each other in the hours after McCann disappeared.
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"Police want to be given a chance to arrest key suspects. It doesn’t prove they have Madeleine but it will rule them in or out of the investigation and that is important," the spokesman said.
This latest development in the case comes three months after authorities announced they were combing through a huge trove of phone records from tourists and residents who were in the Praia da Luz resort on or around May 3, 2007.
https://www.huffpost.com/entry/madeleine-mccann-update_n_4588700