Really simple solution to this, you ride at your own when you f-up somehting fix it back up best you can. If you case all hell out of something just try an fix it unless you really don't know what you're doing, leave the place (a note perhaps) and next time try to come back when there are locals so you can talk to them and explain that you messed it up and just man up to it, then offer to help fix it with their aid and help. I mean I have gone to trails that I thought were abandoned I went 6-7 times an never anyone around and always looked somewhat unused, that day came in with my own tool started a line off the the side a bit worked on it for 3 days straight. Came back after a week the whole line went from 2 doubles to a set of 7, and a note left on the tree thanking for the work put in and a number to call next time I wanna help and ride with them.