So you are saying that this one decision to reduce our troop presence in one very small piece of Syria is going to equate to the downfall of the Roman Empire in essence.....is that correct?
NATO will disband, all the Treaties the US is involved with shall be dissolved, the UK will no longer buy American aircraft or spare parts, joint exercises are over....really?
I would suggest you are far more bothered by this than the folks steering the ship are.....as they know how the relationship thing works.
You are still going to buy American aircraft because you cannot build your own.
You will have to have US support and have to train to fulfill your role in those very treaties and agreements that exist as it is necessary for your own interests.
Let's accept that getting involved in a Civil War not your own is a very bad decision.
Staying out of it is the best idea.....and getting out as quickly as possible should you get involved is the better plan.