"My points of disagreement:

The US is involved in nation-building, not assisting the police force of another nation."

If the US is involved in nation building AND it's not assisting the police force of this nation, it's not nation building. If you right, that's one obvious thing to focus on.

"The US deposed the former government and then conducted voting which installed the US-backed puppet."

"A Loya Jirga (Pashto: لويه جرګه, Persian: جرگه بزرگ) is a "grand assembly," a Pashto phrase meaning "grand council." A loya jirga is a political meeting usually used to choose new kings, adopt constitutions, or decide important political matters and disputes.[1] In Afghanistan, the loya jirga was originally attended only by Pashtun groups, but later included other ethnic groups. It is a forum unique to Afghanistan in which, traditionally, tribal elders meet together.
...
The phrase loya (great/grand) and jirga (council) is an native Avestic word of Pashto origin for grand council – began some 5,000 years ago amongst the ancient Aryan peoples. It was used over time for the selection of rulers and headmen and the airing of matters of principle. Islamic tradition has a not-dissimilar system."
http://en.wikipedia.org/wiki/Loya_jirga

"Then the US tried to create a police force and army loyal to the puppet government and therefore the US. That is more political than policing.

The US is attacking what the US perceives as enemies of the US, not necessarily enemies of the Afghan people or Afghan government. "

I think if the US focused all it's effort on capturing Bin Laden, you could then have a point.

"In fact, the Afghan government, even though heavily dependent upon the US to stay in power, has repeatedly protested the American treatment of it's civilians and stressed the need to negotiate with what America perceives as enemies. The Afghans don't necessarily regard the Taliban as hostile, and neither do the Pakistanis."
The US doesn't necessarily regard the Taliban as the enemy, either.

"When an army invades a foreign country to rid that country of elements hostile to the invading country, not the "host" country, that's called war, not policing."

But *that* was over years ago- that was over in a few weeks.

"When that operation has gone on for 7 years with the hostile elements stronger than at the beginning, that's called failure. When the invasion creates more problems than it solves, that's called a disaster."

Look, when they controlled most of the country, that was when they were actually "stronger".
Much of the problems in Afghanistan has largely to do with the problems in Pakistan.
It's fair to say that we seem to be losing the war in Afghanistan, but this isn't the same as ours enemies are winning the war, or even getter stronger. We lose the war by not getting enough progress, and losing focus in general. In other words, the people in Afghanistan could simply have less confidence now, as compared to eariler- but this doesn't mean they have more confident or trust in our enemy. So such things as corruption, crime, and disorder in general could be "the side" which is winning.