Posted: 14/05/2015 at 19:36
People don't like change. You'd be amazed how stubborn people are and indeed blind to the positives simply because "its always been that way".
Repair the fence, put up sign-age reminding them that it is private property, inform the local police community support officer (it is criminal damage after all and you wouldn't let them get away doing that to your house so why lay back and let them do it to your garden?) Be prepared to have to fight for it.