I am sorry to say Ultraviolet, people can just walk et al out of their country, and they can stop paying their taxes. Whether they choose to and whether they do is another matter.
People walk out on their own countries every day, it is why countries have immigration policies and we have people known as refugees. Many people refuse to pay taxes on principle, others choose not to pay taxes because they gain the money illegally.
If everybody except for the politicians and military in the US stood up in one voice and said, get our troops home today, give the order to pull out today, and were sincere in their voice and united in their stance, all troops would be pulled back today. Trouble is, not all people in the US agree with this, some want the US troops there for a variety of positive and negative reasons.
The same applies to religions, they might see what the leaders are doing is wrong, but they can see the greater good of what can be achieved. They know of the greater good, because they have lived it and experience it every day of their lives.