What about that 9-11?

I am asking this as a person who had detailed knowledge of the attacks of 9-11-01 since 1997, and who told about 130 people, including law enforcement in three countries, about those attacks over a period of four years before they happened. Why in the hell were people so adamant about ignoring and disregarding everything I told them? If now were a year before 9-11, and someone came up to you saying he had found out about airplane attacks against the WTC and pentagon, and US Capitol building, and gave you details, and told you about when the attacks would be executed, what do you imagine you might do?