I find it amazing that you hang onto the opinion of "experts" that fall in line with your beliefs but you systematically discredit or dismiss any opinion by a PhD-holder that refutes your claims. Nice double standard.
"Maybe you know more about analysis of a plane crash than the physicists and other experts who don't believe it was an inside job." See how that works? 
I personally don't care about another investigation because it will accomplish nothing more than wasting millions of dollars this country doesn't have. And I would bet the only thing it would end up showing is that there were massive incompetencies and failures in the chain of command in the events leading up to 9/11 that could have prevented it. Not that some shadowy government group used holograms to fly fake planes into a building while simultaneously detonating it with thousand of pounds of explosives that they lined the insides with. 
See you cannot make up your mind about another investigation before it has even begun. That means you are already convinced everything happened the way the media portrayed it. You have more to lose by not supporting an investigation. Because WHAT IF this was orchestrated?? How would you view your leaders when you realize this is what they were spending their time and minds planning. Instead of planning a mass transit system, alternative energy plant or something that would benefit everyone they instead planned an attack on their own country!?
There are too many question unanswered at least just come out and be honest and transparent about events!
A few issues on a long list:
1. No plane Debris at Pennsylvania Site.
2. No lawn damage in front of Pentagon Impact Zone.
3. Small hole in Pentagon.
4. Pentagon video showing a blurry object that is too small to match the size of the "plane" identified by media.
5. Surveillance tapes near Pentagon confiscated. Why not released??
6. Witnesses at WTC (Two) claiming No Second Plane on video. Were they on crack? One committed "suicide".
7. WTC 7 collapsing and owner Silverstein later admitting they pulled it. Since when do they make such huge decisions without informing the public? This was a 50 story building!
8. Some hijackers alive and well abroad. What??