First, in reply to the top portion of your post, I refer to my own post #57, in which I detailed what happened in Palestine during Clinton. I quote myself:
To clarify, the PLO only made the accusation... it was the general public that dragged him through the streets and brutally tortured and ultimately murdered a member of there own nation. It was the mothers and fathers who brought their own children out to desecrate the body of the accused. Granted this is one example, but I know of about 6 more, and this is fairly common among middle eastern cultures.
That is, indeed, a horrifying example of mob violence, not too unlike the lynchings that were carried out at one time in this country. Does that mean that the Palestinian culture views torturing and killing as morally right?
Why do you think the middle eastern man tortured and ultimately strangled to death his own daughter in Canada and called it an "honor killing"? You believe that people with these as moral values are going to be horrified by waterboarding? Time to get a reality check.
That is yet again a horrible example of religious fervor gone wrong. Why do some of the ME countries still abide by an Old Testament kind of justice? Not everyone had made it into the modern world, but then, I don't think that means that they view torturing of prisoners as a positive thing.
And, there has been more done than waterboarding.
Part two answer: I do not think that we have failed so often. History is covered with the success of spreading freedom in other lands.
However we have lost many times, but normally by our own choices. We lost China because our government refused to help our allies there when they were being over run by communists supported by the Soviets. We lost Vietnam because right when we made peace we withdrew all support and in came the Soviet backed north Vietnamese. On down the list it goes. Carter ignored the Shaw of Iran, a very westernized leader, who was than over run by the current fruit bat who doesn't believe the Holocaust happened.
There are other reasons though. Every horrible dictator divides the country into groups and pits those groups against each other, in order keep focus off of themselves. (a tactic used often in the 90s) Saddam, for example had a huge group of people that thought highly of him because he was 'on their side' against another ethnic group. They knew he was a scum bag, but he was their scum bag. Even Castro had a small group of dedicated followers in Cuba. So rarely is a country uniformly against the evil dictator.
Finely, not all dictators are automatically bad. Sometimes people come to power that really, and honestly want to improve things, and move to that end. Is a republic better? Absolutely. But it's hard to convince people in another country that this is better when the person in power is not all that bad.
Last, I'd say, sometimes the people, the public... is just really screwed up.
More like the government horribly screwed up.
Your Vietnam example is an interesting rewrite of history. That unfortunate country fought the French for independence, and won in '54. The leader, Ho Chi Minh, had the temerity to call himself a "Communist", and so bring down the wrath of the US on his head. He fought us for 19 more years before we finally gave up and allowed Vietnam to be both united and independent, which happened soon after the military dictatorship of Nguyan Cao Key was overthrown.
Meanwhile, the Khymer Rouge took over Cambodia, with the blessing of the US government, and proceded to kill off two million or so Cambodians before the Vietnamese invaded and deposed Pol Pot.
The notion that we can spread democracy through force of arms has resulted in more disasters than successes. The Vietnam fiasco is one horrible example. Iraq is becoming yet another.