What has allegedly happened on 9/11 has influenced a LOT of things related to 'counter-terrorism' in the US nowadays. I'd say it's a very good thing to find the truth behind what happened, if it impacts the daily lives of not just US citizens, but also of people around the world, so immensely. 9/11 was where counter-terrorism law was essentially born.
Well yea i sure would wanna see all those ridiculous laws out of my country (i'm not in the us), but what do you think would change assuming the entire world would be presented super-hard totally undeniable evidence 911 was an inside job ? NOTHING.