No, that is not what was told to us at the time, and that is not what all the history timelines say. The invasion of Afghanistan was done in direct response to the Al Qaeda attacks on the USA on 9/11. It was a retaliation for the attack, which is why NATO was able to participate under Article 5 justification.

Yes, it was indeed to "get one man" - Osama bin Laden. The official story is that the Taliban refused to hand over Bin Laden, and that triggered the US and NATO attack. We now know that the Taliban had offered to hand him over, but that the US rejected the offer because they wanted a war in order to create a military presence from which they could put pressure on Russia and Iran.

I also bought Obama's message of "Hope" and "Change". We got neither. Obama turned out to be one of the worst Presidents in history, just like - as you say - every other President since Ford.