You have not actually said on what you base your beliefs on - other than to throw up other un-related conspiracy theories as a defence. I call that tarring everything with the same brush. Don't you?
Now do yourself a favour and watch 9/11 The Ripple Effect - here is the link and then tell us all exactly why it wasn't an inside job or why there is absolutely no question in your mind why it was done by Osama and co.