"Why didn't gravity bring down buildings 5 and 6? They burned much worse than building 7 did, and one of them got a great big hole knocked in the center of it by falling debris from the main tower nearest to it. Gravity still did not bring them down. Why? "

The aliens did not turn the gravity generators ON in those buildings.

So, the fact that only the lesser "damaged" building collapsed is proof that my theory is correct.

Obviuosly, the Martians, a dying race ( see Burroughs et al) are HAPPY about the melting of their icecaps, and the warming of their planet. Since humans were about to stop global warming by sutting CO2 emissions, the Martans took steps that will lead to a global nuclear war, which will cool off the earth enough for them to live here comfortably, as well as keep humans from altering the increased solar output.

It is so obvious- if you can't see it, you must be part of the Martian coverup!