Personally, i think the visual evidence is stronger than your realistic assumption that if it was a controlled demolition then how could so many involved people remain silent.
I suppose careful planning and alot of money is the answer.
Sometimes in our cushy worlds we forget during most of human history many human beings have not blinked an eyelid regarding killing human beings to get ahead.
Many of us do not realise the world's major banks have their roots in financing wars around the world, especially in Europe during the 19th century. Many do not realise the Bush family was involved in the financing of the regime in Nazi Germany. Bush's grandfather was prosecuted for his connection with Nazi Germany.
(see http://en.wikipedia.org/wiki/Prescott_Bush )
You need to watch the videos about 9/11 on YouTube.
I watched them a few years ago, when some strange lady sent me an email with all of the videos.
Some of the points made out as facts include Bush's brother owned the company that managed security at WCT and for a three day period just before 9/11, the WCT was shut down to the leasees and certain workmen were there.
The interviews of those who say they were tenants in the WCT seem credible.
When WCT falls due to asserted Saudi cause and then USA invades Iraq, it is all too questionable.
Clearly, no passenger plane stuck the Pentagon. That is absurd.
Whilst it is realistic that it would be difficult to keep people involved silent, the greater realites are no passenger plane crashed into the Pentagon, the three WCT buildings were felled by controlled demolition and how could radar towers and air forces not intercept four supposed hi-jacked planes.
