I would like to clarify some things for you:
1. Going halfway through the Dep isn't a valid credential to say you've been on both sides (or at least the serving side), all you did was consider enlisting then decide not to.
2. I hope since starting this topic, (the currently expanding) isis has helped you see that U.S. Military presence in the middle east did have a positive global impact.
I think you might have valid concerns about whether or not we should be fighting another man's war or more broadly in the middle east (although i disagree- I think we should be there), but I don't like how you ended with if we're ever attacked you would be the first to sign up. We were attacked multiple times as Slushpuppy pointed out. For someone so gungho about the Marine Corps (or maybe you used to be), you should realize 220 US Marines were killed in the Beirut Barracks bombing in 1983 and I honestly have no idea how many Americans were killed on U.S. soil on 9/11.
I think Muslim Jihadist Extremists (etc) are dangerous people and they will strike again if they are given the opportunity.
The problem for you I think is, you yourself don't truly value the U.S. military. It probably annoys you when people expressed gratitude for your service when you hadnt even served yet and you started to get the idea that serving wasn't a big deal and people are just brainwashed into thinking it is.
All I can say is, I don't think the U.S. Marine Corps is the right service for you if you really think we haven't been attacked in such a way that warrants us invading at least Iraq and you should consider changing your RuneScape name. It personally offends me when you haven't earned the title yourself, have no real connection to the Marine Corps and tout that name as if it's proof you're a Marine or know what it's like to be a Marine/serve.
On a side note:
I also agree with what we did in the Korean War and WW2, but it doesn't make sense to me that you would support us invading N. Korea but not Iraq. Muslim Extremists were responsible for 9/11, what exactly did North Korea do that was worse than that?