I put the webbing and rap rings there last year (or was it early this year? I don't remember). It was raining, I didn't want to downclimb nor pull my rope through the hangers. The webbing was short enough not to hang over the edge, so they wouldn't be visible from the ground, and not ideal for TR. Made getting down much easier.
Can't imagine why someone would cut them, they were probably the least obtrusive anchors at PK.