I have the same issue with careless bike rack users where I park. I'm sure it's not just the locks that get thrown around. It looks like some throw their bike in and lock it where it lands.
The worst offenders lock wise are those with cable locks who unlock it and pull one end. The lock then snakes around taking paint off everything it bashes into.
My girlfriends Pashley has had to have the gear cable replaced twice in the last two months because of people carelessly locking up next her, both times she has returned to her bike and the cable has been ripped out.
My girlfriends Pashley has had to have the gear cable replaced twice in the last two months because of people carelessly locking up next her, both times she has returned to her bike and the cable has been ripped out.