Would you rather fight our enemies on their soil or ours?
We've had one too many 9/11s. I don't want another one.
Fortress America worked in the days that the Atlantic and Pacific oceans were an effective barrier to foreign attack. They no longer are, and haven't been since at least a few years after the end of World War II, and quite probably since 1941. (Granted, we never had a Japanese invasion of California, but if Midway and a few other battles had gone the other way, we could easily have found out whether the Japanese were capable of mounting an invasion. Full Japanese control of Indonesian oil, Philippine food, a network of Pacific island bases, and the resources of Australia could have made an invasion very difficult to repel.)
Today, with asymmetrical warfare capabilities, the only way to stop a serious terrorist attack in the United States is to keep rogue states afraid of mounting such an attack. That requires the ability to project power far beyond our shores. Hopefully that power will rarely be used, but if it's not present, we'll rapidly wish we had it.
Theirs. Which is why we need to get the Muslims out of the country. That is a domestic problem.
We've had one too many 9/11s. I don't want another one.
Then you have the wrong strategy. Despite spending TRILIONS on our military, they couldn't shoot down two unarmed subsonic planes within US airspace with nearly an hour's notice, something that could have been handled by a couple of guys with Stingers. 9-11 was not due to our lack of foreign intervention, but was due to a failure of emphasis upon the militia-based system our founders intended. Were every American male trained in military service, armed, equipped with communications, and empowered to make an arrest, 9-11 could never have happened. Without the FAA socializing the risk of crappy cockpit doors and unarmed pilots with their approval and disallowing armed citizens as passengers, taking over those planes would have been dicey.
You are dead wrong about 9-11.
I would MUCH rather put my money into Standard missiles, lasers, and other SDI assets than carriers, tanks, and heavy airlift capacity. I would also love to see proper inspection of container ships. Make them build a floating port and offload at sea for all I care. I'm NOT paying to defend the rest of the whole damned planet.