Let's be honest that selfie stick rule has absolutely nothing to do with what happened on the ride, that is the excuse. The real problem with selfie sticks is a little more subtle. New digital cameras, unlike old film cameras, can take shot, after shot, after shot with bad ones deleted not costing quite a bit of money each and every time the button is pushed. So old film camera, near enough, good enough. New camera, hmm, didn't like that one, lets try again and again and again, how about trying this or this or etc.. Now if you ask someone else to take the photo, gain limits on how many tries and near enough is good enough.
Basically people taking shot after shot are causing traffic flow problems are around the park. People are blocked from seeing popular places or cough taking their own photograph there. Flows to concessions stands are slowed because people are in the way. It is not one shot with a selfie stick it is hundreds be each selfie stick aficionado.
Realistically the park wants selfie sticks, free advertising as the photos travel around (millions of dollars worth), problem is, they are causing real traffic flow problems as people are not stopping for a say around a minute for a single shot, they are being awkward repeating that shot again and again and again until they get it right and they are not doing just at a couple of locations but all over the place. Also I am sure the park could or already has photo taking concessions. You know pay a buck and get a quick photo emailed to your phone (sneaky huh, money for the concession and email and contact details and photographs on record, taking that into account the can really, really squeeze down the price of the shot).
You can do some smart stuff with the photo taking. Fixed point photo spots, linked to a pre-registered phone. Walk around the park offer of a 10 cent auto shot from a fixed well sited camera, based upon phone proximity (again other revenue opportunities). Toss in a 10 second video for a buck.