http://www.nytimes.com/2012/09/11/opinion/the-bush-white-hou...
http://www.theatlanticwire.com/politics/2012/09/bush-knew-mo...
When bad stuff happens to skyscrapers, or any building collapses for not entirely known reasosn, normally every millimeter gets photographed. It's like a murder scene, you don't just pack it up and destroy it. 9/11 didn't even have a pretend investigation.
9/11 was informative indeed, but not about "what would happen if we got rid of the spooks in our country", though the irony of such a conclusion is of course delicious in its own way. No, it's rather a statement about how the sun revolves around the Earth if the party says so, and that's about it. Nothing any scientifically thinking individual should have even one minute for in earnest. Fuck conspiracy theories and Alex Jones, all that was needed was thinking for yourself, watching news footage (as if there was a way to avoid it) with anything resembling an attention span, and listening to politicians while also reading between the lines. That is not too much to ask for a grown up individual in a supposedly democratic society.
So that you throw out that cliche of 9/11 having been an attack that, once and for all, proved that whatever "security measures" anyone could come up with are justified, and would "prevent worse things from happening", while talking about "paying any attention or have a memory" -- I am not sure if I should find that funny or shockingly sad.
I see what you said, and raise you by "9/11 was information about the validity of the process by which the vast majority come to conclusions, and that all votes are not equal." Which is so far from anyone that can be said in polite conversation that I usually keep it to myself, but I genuinely believe it. That year I realized I'm with mostly fools, stuck on this planet in a circus, and that all my previous confusion about "how could something like the Nazis ever happen" was just adorable.
You're projecting. That's like saying there was no point in investigating the rubble of 9/11 or the explosions because it's all so obvious anyway. It's called "conclusion prior to investigation". If you had arguments, you would mention them. So there.