The WTC strikes were a turning point in history with long lasting effects on the west, but Osama bin Laden wasn't quite a singular entity guiding the historical forces that led up it, not coming anywhere close to the amount of personal influence that Stalin or Hïtler held over events. He never commanded standing armies of millions for one, only a leadership role in a terrorist group. His values and ideas in general are also quite common place among others in the middle east, but he was most likely an above the average bitter islamist with very rich family and tragically in the right place at the right time.
See also:
https://en.wikipedia.org/wiki/IslamismTo put really shortly what he was fighting for and against:
Against any outside influence and for the purity of Islam. Throughout his life he saw both USA (the west) and the Soviet Union ruin his country and lifestyle and people. He first gave the run (with generous backing from the west) to the soviets and then turned his attention back to the west.
The same basic thinking also underlies Daesh/ISIS and is an important factor all around the region.
America is the great Satan and so on. France is widely seen as the European nexus for similar corruption, hence the recent strikes there.