So did you want to provide some of those other reasons?
Why does the US want to stop the Taliban from taking over? Because they are the same group of Islamic fundamentalists that gave safe haven to Al Queda and would almost certainly do the same for them again? Because they want to take away the religious freedom of anyone they can? Because they treat women like third class citizens? Because if they do take over it's a given that they will slaughter anyone who cooperated with the West?
Reason 1. A Republican president always loves a war. Why? Well wars, especially successful ones, are great for the president's image.
Reason 2. Wars are great for giving lots of money to your buddies in weapons manufacturing, who will possibly donate you more money.
Defense OpenSecrets
See the increase in defence donations? Republicans get far, far more than dems when they have a president in office, when they don't they get slightly less. This is their industry, this is way of making political funding.
Reason 3. The Republicans like to be at war to be able to get through their own repressive policies (like the "Patriot Act") while appearing to still "love the constitution", because without war nobody would accept this rubbish.
Reason 4. To project US power. The Cold War had ended, the US had very little reason to carry out large scale interference in other countries. Bush wanted to make "America great again" after 8 years of Clinton not trying make the US "great" by going around the world and invading places or flexing the US's muscles. Serbia and Somalia hardly look great on your CV.
Reason 5. The need for a common enemy. Well the common enemy was found anyway, due to 9/11. However Bush had been toying with China before this, which relaxed after a while. The increase in tension now with China is more to do with the Chinese using the situation for nationalism reason to gain popularity for a non-democratically elected govt.
So al Qaeda became the new common enemy, Bush squeezed this for all its worth.
But the problem is, if you have an enemy you need to fight it, and fighting it in the traditional sense makes sense to a lot more people, they can see action and understand it. So war in Afghanistan was a logical next step to show people how serious he was. It also helped promote Islam as the new common enemy to replace the USSR, which Clinton had done nothing about, but which the Republicans need (and relates directly to Reason 3.)
Reason 6. Get a foothold into central Asia for the US, preventing Russia and China from getting in there. Afghanistan borders China, slightly, Russia has had its war in Afghanistan in the 1980s.
Reason 7. Control of the hydrocarbon resources of the Caspian sea and Middle East areas.
And you can be sure there are other reasons too.
Why does the US give a damn about whether the Taliban control a country so far away, or whether someone else does? Are the Taliban any worse than the Saudi monarchy? I doubt it.
The US govt will make noises about democracy, freedom and all that stuff, but when it comes to the crunch the US govt will get rid of a democratic govt that doesn't support them, or will get rid of a country that allows freedoms etc, and allow them to be replaced by non-democratic and non-freedom loving govts if it suit THE NEEDS OF THE US GOVT.
Take Venezuela for example. OPEC country, Chavez gets in, starts getting support from OPEC members to strengthen OPEC's hold on the world markets. That was 1999 onwards.
2002 the US helped the coup to get rid of Chavez. Initially successful but ultimately it failed.
Why would the US govt get rid of a democratically elected leader? Why would it basically tell people it's not democratic from then on?
The fact is, since the end of the Cold War, most of the US wars have involved OPEC members.
Kuwait 1991.
Iraq 2003
Libya 2011.
Iran hasn't been invaded yet, because the dems won't do it, and it'd be a very dodgy war, no so easy to win. So it's sanctions instead.
These last three plus Venezuela are the 4 OPEC countries that opposed the US. Is it any surprise that Iran wants to get nukes? Then they can scare the hell out of a country that would love to invade.
The US doesn't give a sheet about religious freedom either. The US supports plenty of countries which happily deny religious freedoms to people, like Pakistan for example, Saudi Arabia is another massive example.
International Religious Freedom Report 2002 Saudi Arabia
"Saudi Arabia is an Islamic monarchy without legal protection for freedom of religion, and such protection does not exist in practice. Islam is the official religion, and the law requires that all citizens be Muslims. The Government prohibits the public practice of non-Muslim religions. The Government recognizes the right of non-Muslims to worship in private; however, it does not always respect this right in practice."
Saudi Arabia uses capital offence of apostasy to stifle debate Amnesty International
"Badawi – who founded “Saudi Arabian Liberals”, a website for political and social debate – has been in detention since June 2012 on charges including “setting up a website that undermines general security” and ridiculing Islamic religious figures. "
http://www.religioustolerance.org/rt_saudi.htm
"Saudi Arabia has essentially no separation between religion and government. Their citizens enjoy little religious freedom. "
Need I go on? If you're going to claim the US gives a damn about religious freedom in other countries, you'd expect the US to have invaded Saudi Arabia by now.