Even though it's rare, accidents can happen. Every ride might have an accident at one day. But if you have a ride with already 2 similar accidents were someone fell out of a car, and then remove the seatbelts you are asking for number 3 to happen.
I really want to defend smaller parks, and I admit I had a good time in the park, but this can not be excused. Also, the lions will be happy, as their cages are next to the now closed rollercoaster.
Just talking as an enthusiast, it's a shame as the quirky nature of the ride made it really enjoyable. But it is obvious that the park is not able to operate it safely, and safety should always be number 1 priority in this business.