I'm gonna get hammered for this, but here goes:
I wouldn't be overly suprised if sport routes were sabotaged with acid or something.
I remember hearing a story about how someone had deliberately rigged a death sport route up there years ago.
Apparently, they cut the heads off some bolts and epoxied them to hangers, then epoxied the whole set-up onto a possible line. The person reporting thought the route looked a little hinky, so pull-tested the first hanger and it popped. He then cleaned the whole affair, reporting that even the anchors were glued onto the wall.
Scary stuff.
Erik
Edit: Not to mention the Todd Skinner route sabotage. Just sayin'