Now this might sound kinda weird but I've been to loads of sites and not gone near them. This is not because of fences or anything, often seeing a stone isn't what it's about - it's seeing the context. So although I have visited 750+ sites in the last year I haven't had as much impact on them as you'd imagine. I'm at peace with that in my mind. Can you honestly say the same about your 'litter'?