Why do you think some evil folks in our govt. helped destroy the WTC towers?

I've read most of the stuff that tries to make it seem as if the government was involved in the 9-11 attacks. I don't know that they were involved, but I do believe they were well aware something was going to happen and took no steps to prevent it. The most obvious result of 9-11 is that the members serving in our government have lost their minds.