This might be overanalyzing a bit, but if you look at the Iraq & Afghanistan wars, and compare the two overall strategic options put forth here, I think you might see that there was a better choice. This is kind of an expansion of what CFL said (if you don't mind CFL):
Option #1 (reality)- Identify Afghanistan/Taliban as supporters of Al-Q, gather intel regarding plans, pers involved, locations of camps, evidence of links to 9/11, etc, etc, etc. Invade, destroy known camps/hideouts, topple Taliban, look high and low for Bin Laden and assoc. Scour the countryside, failing to find him, assumne he fled to Pakistan and points beyond.
STOP, go to Iraq, raise heck, topple Saddam, attempt to placate populace, fail (for the time being anyhow).
Achievements
Afghanistan)-Taliban not nearly the threat they once were Internationaly (although domesticaly a real threat), Al-Q camps destroyed.
(Iraq)- A real monster is removed as leader of Iraq, oil flows from Iraqs wells to world (as opposed to the balck market oil that flowed since the end of the '91 war), Baath party removed, organizations of torture and depravity destroyed, world sees first hand that Saddam really didn't have WMD
, threat that Saddam could attack a neigbour and provoke another war outside Iraq removed.
Failures (Afghanistan):Bin Laden still out there (as well as most of his top associates), Afghanistan is no less a breading ground for terror than before, Ghanistan's infastructure is worse off than before (if that's possible), most of country controlled by warlords who are as bad if not worse than Taliban, opportunity lost to better the lives of perhaps the poorest people on earth, and an opportunity lost to show the Arab world that the West is capable of working with them to better the region.
(Iraq)- Insurgency that seems poised to overwhelm US forces at times doesn't seem to be dying, Iraq on the cusp of civil war, otherwise marginal figures (Al-Sadr) gain power and 'respectability' by opposing the US occupation, civilian foreign workers kidnapped/executed fairly regularly, Iraqi 'rich' citizens kidnapped and murdered very regularly, regular attacks on Iraqi police/NG killing good men that could help bring country under control, despite elections on horizon and 'handover of power' the country seems less and less likely to become anything that resembles a democratic state.
Option #2- Identify Afghanistan/Taliban as supporters of Al-Q, gather intel regarding plans, pers involved, locations of camps, evidence of links to 9/11, etc, etc, etc. Invade, destroy known camps/hideouts, topple Taliban, look high and low for Bin Laden and assoc. Scour the countryside, failing to find him, assumne he fled to Pakistan and points beyond. Continue search for Bin Laden, pressure Pakistan to give full assistance to the coalition in search and arrest of Al-Q operatives, with the help of Intl community (especially the Arab world) develop some form of responsible gov in 'Ghanistan (not necessarily democratic), gather intel from US sources as well as Intl intel sources regarding terror groups and their activities (thereby gaining their trust in the US findings of terrorism). Once stability (relatively) has been gained in 'Ghanistan, and evidence supports action in other states (ie Iraq), and UN/Intl support has been gained, take action elsewhere (Iraq). Then if the crap hits the fan, it's not just the US's problem but also the problem of every state that supported action.
Possible achievments: (Afghanistan)-Taliban not nearly the threat they once were
Internationaly (although domesticaly a real threat, Al-Q camps destroyed,
Bin Laden still out there , Afghanistan is
no less not a breading ground for terror
than before, Ghanistan's infastructure is
worse off than before improved, most of country controlled by
warlords recognized government who
opportunity lost to better the lives of perhaps the poorest people on earth,
and an opportunity lost to show the Arab world that the West is capable of working with them to better the region.
(Iraq)-With a clear success in Afghanistan, and a clear plan and mandate in Iraq, the US could only improve their chances of achieving it's stated goals. With a plan, and clear goals, it also gives the US an 'exit-strategy' once those goals are achieved.More Intl/Arab support for action means more sharing of the pain and cost (US economy not put into serious jeopordy), a real handover of power to Iraqis is established and a pro-west/US government a possiblity (as opposed to the zero chance such a government could survive one week today), a chance for real reform in the Arab world regarding Arab-US relations.
otherwise marginal figures (Al-Sadr)
gain power and 'respectability' remain marginal by opposing the US occupation.
Or as CFL stated so perfectly, finish one job, start another. Yes, Infanteer, you have to look at the overall goal, but it's one step at a time.