The thing with wheelchairs is that they are more often than not the last item to be put in the hold and presented to the baggage handlers just a few minutes before the EOBT. Thus they are handled with some degree of aggressiveness and suffer accordingly. Airlines are obsessed with on-time departure to the exclusion of practically anything else these days so bent belongings end up paying the price. I'm not defending this state of affairs, just saying it as I see it whenever I'm on duty.