I know, and you don't need to point to Operation Northwoods to "prove" anything because American Government officials have proposed much worse things and have done much worse things.
Like MacArthur proposed using nukes like conventional bombs to completely irradiate the Korean - Chinese Border. This would not merely kill Millions, perhaps billions, but it would cause a nuclear winter. For that, MacArthur was dismissed. That was a proposal.
What people forget is that MacArthur fired upon American World War One vets protesting to get their War bonuses because of the depression during the Bonus War. You don't need to make up conspiracies, what governments have already done/doing are bad enough.
Basically. Buildings don't fall like Jenga bricks. When something bad happens, they tend to implode, be it on purpose, if an airliner crashes into them, or if the aforementioned building collapses next to you and causes you structural damage.