I feel like this happened: Police decided on day one that the families were cleared; Police decided on... I'm not sure which day, perhaps day 3(?), that WT did not wander off and get lost, etc. According to Jub, he has revisited, and the only alternative is for the sun and earth and stars and heaven to move in harmony for a minute, to provide an opportunity to some sick buggar who happened to be on the dead end street for some reason unknown. Police try to think.. could it have been a repair person on the street.. and voila, FM tells police about the washing machine repairman who would have come that day, but was told not to.
They set their sights on BS.. perhaps because in addition to FM telling of a would-have-been visit, they also later got a call from perhaps the mother of the grandchildren that BS was caring for. A mother who felt she should have custody of her children, perhaps. Perhaps she made some kind of allegation to FAS about him as well, perhaps after hearing through the family grapevine that he was supposed to have visited the by-then almost-famous house from where WT was taken.
Then it all fits for police, has to be him, so they fully look into him.. find these historical charges that for some reason, were not pursued at the time, almost 30 years prior. After looking into the matter, they felt it would boost their case for BS abducting WT, if he was already a proven child molester, since it is mostly unlikely that a first-timer would do such a bold abduction, get completely away with it, with the ability to completely hide the body. So they interview the participants of the historical case, lose some notes in the process.. ask them to renew the case with the prosecution. Simple as that.
The ex wife I'm sure, was all too willing to revisit the case. By now, 30 years later, the children have surely hold whatever believes the exwife wanted them to hold 30 years earlier. Police renew the charges, arrest BS, he is incarcerated, perfect. But then he applies for bail, when a judge looks at the case, and determines that it isn't such a strong case as the police are presumably thinking it is, and allows BS to go free on bail until his day in court.
When it comes to children, I know that investigators have to be specialized in how to approach them and get information from them, withOUT putting preconceived thoughts in their head ahead of time. It is important because they need to ensure they accuse the correct person. Young children are impressionable. Even if a child is pre-verbal, I believe it is possible, with the right qualifications, to determine who the perp was. To now bring the case to trial some 30 years later, it is really too late to get the right person, and do the investigation properly from the beginning. So they have notes from the past, but according to the judge, portions of them conveniently seem to be missing.
Sometimes police *do* get tunnel-vision in a case. If they have ruled out other possibilities, and 'snatched by a pedophile' is the only one remaining, it would not be difficult to get tunnel-vision. The man's life is ruined.. he has lost custody of his grandchildren, he has lost his business, he may have had to move into a smaller, less expensive home by now. If they have something on him, or on a pedo ring, then get to it, and lay charges, lay the cards on the table to allow him to defend himself. Some say police are in no hurry since they must believe WT is already dead... but what about the next victim? If there is a murderer on the loose, or a ring that harms children, and perhaps even kills some of them, there is a huge hurry, I would think. If WT was taken by some kind of pedophile, or pedo ring, I doubt, imo, that it would be just a one-off. How could they live with themselves if they took their sweet time, sat on evidence, postponed an arrest(s), and another child dies in the meantime?
Nobody is saying the girls were not abused. It is not clear who the abuser was. Could have been the mother, for all we know, nevermind her criminal pedophile brother.