Apparently, we're "winning."
I have no doubt that Operation Steel Curtain is indeed a success. We have made many military operations that have been successes. The problem is that these military operations are like a game of whack-a-mole. We do it, but then they come back, and then when we think it's bad enough, we go on another clean sweep.
It's kind of like the machines destroying Zion in the Matrix. Sure, the operation may have been successful, but they keep on leaving the humans alive to rebuild. Of course, in the case of the Matrix that's an intentional choice to maintain the status quo; in our case, it's because we don't have a choice.