Indeed.
Incidents like this should result in the business facing a proper investigation by health and safety authorities, criminal charges for the owner if warranted, closure of the business if necessary and court ordered compensation for the victim after civil action.
The question that is never asked here is, was the business negligent? Were they responsible for this happening due to their negligence?
It's stuff like this that clearly demonstrates how far behind Thailand actually is when it comes to occupational health and safety, training and competence and safety culture in general.
If I were a betting man I would wager that there were insufficient health and safety systems in place to stop this occurring, which really would indicate this business should not be operating.