Stephen, it is how the police work.
How many times do you hear the police ask for witnesses who saw strangers hanging around when a crime has been committed?
Have these people shown up since?
The bogus charity workers could have been going around the apartments, sussing out who lived there and if they had children, you really don't get it do you.
Well if you want to think Madeleine was abducted by aliens that is your prerogative, SY are going down a different route.
and the police have found ?
Answer, NOTHING and no trace of Madeleine.
Merely because people hang around in a street, does not make them abductors or burglars.
The bogus charity workers, well hardly anything new there, but it doesn't make them potential abductors, no matter how much you wish otherwise.
I don't believe aliens abducted Madeleine, but the point I made, which is fairly apparent, is that a missing child is not direct evidence of abduction.
The other 2 well known theories are:
Accidental death in the apartment; or she walked out of the apartment and 'disappeared'.
As to SY, they are judged by their results.........................