But that's the problem Carana. You say IYO that Amaral hampered the search. The evidence shows that many, many members of the public during the time the investigation was closed came forward with sightings etc ( even Duarte's claim that Pavia didn't follow up these signings proves this ). The available evidence does not prove your contention, in fact it proves the opposite so why do you still feel the opposite is true ?
"Sightings" by anyone was still guaranteed news sales for the media - whether it was by psychics or anyone else, or indeed genuine or invented by hacks with 15 mins. to produce something to fill space.
Some may not have taken much notice of his spoutings (I haven't said the contrary) in NZ, US, India, plus numerous "psychics", but those who might have genuinely have had potentially useful info would have connections with PdL - which is where she disappeared.
Some people may be either predisposed to the dunnit theory, or have been slowly led to that theory via selected translations of articles relating to the idea the X police force is one of the best in the world, then you / one could tend to believe that.
Once that has been "established", it's not that easy to stand back and reassess. Particularly, possibly, if you are local, someone connected to you has had business/ employment affected, someone in your family has been under suspicion before when it was clearly nothing to do with your loved ones and you were terrified of it happening again... you do have a suspicion but can't say anything for whatever reason...