How does anything escape people's notice in a large building open to the public? People can find ways to blend into the background, infiltrate, disguise themselves as a work crew. Any number of possible ways.
One can certainly infiltrate as a member of the public in areas where the public is allowed.
But this would not be true for maintenance & management. In the landlording business,
security & liability are of great concern. So workers are identified & known to each other.
Rigging a building for demolition would be noticed. Unknown workers would be noticed.
Even on crappy commercial properties like mine, we monitor cameras. We monitor work.
Even my tenants monitor suspicious activity (because people are always trying to get away
with something.)
Why not? We're talking about the same government that set up the supersecret Manhattan Project with thousands of workers. Yet they still kept it a secret.
If it's so secret, then how do you know all about it?
The information came out afterwards.
Participants talked about it.
This hasn't happened with the 9/11 conspiracy.
But your claim of the Manhattan Project being kept secret isn't true.
They did indeed try very hard, & with some success to keep it so, but they failed at total secrecy.
Ref....
https://io9.gizmodo.com/secrets-of-the-manhattan-project-were-leaked-a-staggeri-1626524763
The World War II program to develop an atomic bomb was the largest secret project
ever undertaken by the U.S. government. But newly-declassified documents reveal
how it hard it was to keep things secret as the weapon neared completion. Information
leaks were everywhere, even in church sermons.
All spies had to do was go to church.
It was the same during the Cold War. Lots of secrets kept by the government, even to this day. Why is that so hard to believe?
I don't claim that secrets cannot be kept.
But even if a secret conspiracy is real, the probability
that it will remain secret is reduced by these factors....
- The number of people in on the secret
- The length of time the secret is kept
- Changing political regimes
- Feeling guilt & regret for one's actions & the results
It is extraordinarily improbable that such a massive & complex conspiracy with so
many participants both in & outside of government over nearly 2 decades would
still have not a single confesser or snitch. Note how difficult it is for government
to keep secrets in the age of Wikileaks.
I would suggest this to be a red herring, along with the entire argument about how the buildings collapsed. All the talk about architecture and structural engineering is all very fascinating, but it doesn't prove or disprove thing one about who done it.
Far from being a red herring, it's the best explanation for what we observe.
But if one eschews technical analysis of what happened, one can believe anything.
Perhaps God smited the buildings using magic. (Anger at our blasphemous ways.)
I can't disprove that one either.