WH, do you think people could be a part of this conspiracy without having any knowledge of it at all? Like, do you think a lot of them could have just thought they were following orders from the top like any other day before?
That's one thing I don't think you've considered... A lot of these people who helped make the events happen were completely unaware of what they were doing, and it was simply business as usual.
Think of it like this;
The CEO of a company is about to be replaced, he's pissed, he thinks he's earned a lot more than the severance package they gave him, so he decides to hire his buddy to come and rob the building before he leaves... The CEO tells all employees and guards on floors 10-15 to stay clear, they're going to be doing some construction or renovation on that area and it should be quiet anyway, no need for security...
Next day the place is dry as a bone, every dollar is gone.
Are the employees and security guards to blame? Did they have anything to do with anything, or were they simply doing their job, same as always, as usual?
See what I mean, they had no idea what was happening... they were just following the boss' orders...
Think about it.