They haven't allowed outside golf carts to be delivered officially for years. The only difference now is the security gate was removed, so people found a loophole. If anything, they'll close the loophole.
And there have been accidents with golf carts, they are not rare. In fact, an ex girlfriend of mine once went flying off the end of a cart when the turn was made too fast, and busted her head open on the street. Had to go to the hospital for stitches, x-rays, what have you. Since we've been going to the Fort we've had at least 3 accidents with the carts, and I've seen countless others, but that's bound to happen.
It's not like accidents never happen with the carts. So what about all the people that have accidents while riding bikes? Or have accidents driving their cars and backing into things? Or have accidents while playing frisbee in the fields? Disney could be held liable for all of this, so should Disney take away all bikes, cars, not allow anything to go on at the Fort at all, since of course, anything might turn into an accident?