Now. I agree we have had a negative impact IF you measure from BEFORE 2003. Starting from what? The 30s? Sure. But you are essentially trying to determine if the ME is better in a scale of measure that makes no logical sense. Have you read any history books on this region?
1) Wars have always occurred in the ME.
2) Has our involvement fundamentally changed #1?
3) How do you know?
4) How has it changed it?
5) Finally...have you even given it enough time to determine if our involvement destroyed the ME?
Seriously. History isn't measure by years. It is measured by Decades at best. You have no clue if what we have done has fundamentally changed the equation in the ME for better or worse. Hell. My vote is for neither. The most likely is that it didn't change anything. There will always be war there. That is the historical precedent, but that only counts for so much.