We know that WTC 7 was a controlled demolition. When it went down, it destroyed all of the computer hard drives at the stock broker Price Waterhouse. This was done to hide the evidence of who made huge sums of money by selling short the airline stocks of the planes that were involved in hitting the Twin Towers. You can fool all of the people some of the time, but you can't fool all of the people all of the time. ;)
"When bad men combine, the good must associate; else they will fall, one by one." Edmund Burke