I urge you to learn a bit about Osama. In the 80’s he joined Abdullah Yusuf Azzam who was at the time openly calling for “global jihad”.
There is enough blame to pass around, and using the same logic as you did, someone could blame the US itself for the 9/11 attacks because of the support it gave to afghan mujahideen and support of various extremist islamic regimes such as the one in Saudi Arabia...
And you have proof that Abdullah Yusuf Azzam was receiving funds or RPGs to fight the soviets? Osama was a minor player, a foot soldier in the 80s. I have no doubt that he may have been part of mujadeen in Afghanistan that were getting assistance from the U.S.
I have read enough about Osama. He turned against the U.S. and the government of Saudi Arabia after the 1991 Gulf War when he offered Saudi assistance to protect them from Iraq and they spurned him and went to the U.S. for assistance. Long after the war in Afghanistan was over.