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I would say a lot of reasons.

1. Opinion of "experts" is that there is not enough mercury leaking from the fillings to cause health problems. Even though it has been proved mercury is released from the fillings, some people even deny this and believe the mercury is locked tight in the filling.

2. Different people respond differently to the mercury released into their bodies. Some people are not at all affected either because they have strong resistance to toxins (just like some people can drink more alcohol than others before getting drunk), they eliminate the mercury vey quickly so it doesn't store up, or they don't have genetic predisposition to the areas mercury attacks i.e. not predisposed genetically to disorders of the nervous system and endoctrine system. Others are sensitive to the mercury or even the other metals in amalgam. Diet and lifestyle can also be factors.

3. Reaction to Amalgam isn't usually immediate. So, it may be months or years before someone develops a health problem. It depends how long it takes for the mercury to affect them based on points in no.2. Therefore doctors don't make the connection. Also, as people respond differently to the mercury, the symptoms are not likely to be the same in 2 different people.

4. "If millions of people have amalgam and millions of people aren't ill, amalgan can't be dangerous". Well, millions of people DO have problems. Many people suffer from migraines, allergies, hormone imbalance, fatigue, thrush and, muscle pains. These are so common that products to help can be found in supermarkets. It's quite possible these problems are influenced by mercury. Many other people have more serious problems like MS, chronic fatigue, clinical depression, OCD, Bipolar, and other conditions and diseases. They too may well be victims of amalgam.

5. Denial of liability by the dental and medical professions. If they ADMIT they have caused suffering to millions of people, in various way, just imagine how much they would have to pay out in compensation?

There are scientific studies that prove mercury leaks from the fillings. There are scientific studies that prove mercury is highly toxic to human beings. There are 60,000 documented cases of mercuy poisoning from fillings. But there is not one single scientific study that proves mercury amalgam is safe.

Very plausible reasons, Demi, and very well put - I agree with your analysis.

Just to elaborate on your reason #1, it's extremely hard to change public perception about something that has been accepted for so long as "normal" in a culture. When people are indoctrinated to believe something (that's what they teach them in dental school, that amalgams are safe etc.), and an established group of "experts" perpetuates that information, the vast majority of the public accepts it as "truth", especially if they don't experience the sickness themselves.

It's tough business changing people's established beliefs, despite the evidence to the contrary.

We don't need grand conspiracy theories about UN plots to kill people with amalgams to understand human behaviour as it pertains to the amalgam situation. Accepted "truths" are passed down through a culture as a matter of faith, and once those beliefs become engrained, they become difficult to change.

And of course the other reasons that Demi mentioned are mitigating factors.