In general we live in a civil society, and every once and a while some jackass comes along ruins the party and sticks his dick in the mashed potatoes. That party pooper right now are the radical Muslims highly regarded in the Islamic state; where ever they may be. With the birth of ISIS I would actually tend to agree with you, that our military presence should be stronger now than ever before. If we had this discussion 3 years ago, I'd completely disagree.
I take it you've never read the book, "The Art of War" -- having done so, you'd know Sun Tzu would highly disapprove of the United States military actions.
"The supreme art of war is to subdue the enemy without fighting."
"Know your enemy and know yourself and you can fight a hundred battles without disaster."
"Know thy self, know thy enemy, a thousand battles, a thousand victories."
It's no coincidence many successful war time officers read this book, along with some of the most successful executives around the world.
Hot tempers never get people anywhere good.