The fact that WTC 7 collapsed "all on its own" on Sep 11 is hard for most people to rationalize as when you accept this and begin to question the official version of events it will turn your world upside down.
Any intelligent aware person who thinks independently should look at the simple facts. Controlled demolition is what it was.
Take another look at the video of the twin towers collapsing, open your eyes, open your mind: what do you see?