The problem with that rCoder is that the countries you "isolate" who don't want to play fair in trade or other areas, usually wind up forming alliances of their own. Iran and China are good example to date. Unfortunately, IMHO, projecting force is a necessary part of collective defense. Look at some of our allies that are free and secure do to our force projection. Taiwan comes to mind. The Chinese for decades would have liked nothing better than to take that island back...by force if necessary.
It is our force projection that has kept China at bay in regards to Taiwan. Proof of that are the recent missiles China produced specifically to target our carriers and other war ships. Why would they waste time and resources to produce this type of weaponry if our Carriers didn't worry them?
There are many other examples besides Taiwan where our force projection has kept countries free and secure. Whether from Communism, extremist Islamic regimes etc.
Even keeping vital sea passages open for commercial trade has been a mission of our carriers and battle groups in the past.
I would like nothing more than to see world peace break out and countries become good and fair trading partners with each other. For this to happen though would require for human beings to change who they are. It would mean an end to people that believe or practice greed, that seek power for power's sake, that are not satisfied unless they get their way.....these are human traits, bad traits for sure, but they exist and until they cease to exist we will always need a strong military, we will always need to project force to keep those kinds of leaders and the countries they represent at bay.