OK, I admit this is a bit of a silly question because I see this too on rock climbs.
Who and for what reason would one remove some slings or tag lines and two rap rings from a solid tree suitable for rappelling?
I can understand if it is for "aesthetics" but I suspect, more often than not, it is for other reasons.
The tree anchors at Rumney are rapidly disappearing (e.g. Clip-A-Dee no longer has a top rappel anchor, not that it needed one in the first place). From what I gather, it's out of concern that the bark will be damaged by slings, even on stout trees. I have no idea how much truth this argument holds, but some of our mutual friends have mentioned it: so I give it some credence.
In any case, tree anchors don't make much sense in a sport area.
I have removed them at times, particularly in Crawford and at Oscar, because they were critter damaged. Some at Oscar more than once.
I can second the critter damage argument. I've noticed that a lot of ground-level rap slings get gnawed. Much better to tie the slings higher in the tree, where they will likely see less damage (although critters can climb trees).
In all cases, I hate bright red rappel slings. Does nobody sell green and brown webbing any more?
Making an anchor with two huge bolt that will go over the ice and where you can use your PAS, the best???Um... no. That would be the worse solution. Maybe this was in jest.
I think that was in jest! Zing! Good one!
There are actually some lousy, chossy sport routes out here that were purposefully bolted right next to where excellent ice pillars form in the winter. No comment on that practice.