I agree with you.
Even if in the U.S. the police couldn't convince a judge to hold the suspects in custody, the police would be watching their every move. In Aruba, the suspects (with the exception of wire taps) seem to be left alone to destroy evidence, dig up and dispose of a body, etc. This smacks of either gross incompetence OR a rigged investigation to clear one of their own.
Wasn't it in Holland that a group of Muslim teenagers were released by police after raping (and perhaps murdering - I forgot) a retarded girl because ... they were afraid of an anti-Muslin backlash? Great thinking. Ranks up there with "Well, we will release several suspects in a murder even though there is something really fishy going on. And we won't watch them after their release!" As Gomer Pyle would say: "Surprise, Surprise!" The evidence is destroyed and the body is vanished.
From everything I have read and seen, my feeling is that it is a rigged investigation. It is quite evident the Aruban system easily allows the "well connected" to get off easily. I am sick and tired of people talking about the superiority of their system.