Thai schools are for-profit, non-tax paying businesses. I spent several years demonstrating to schools that they could save money and generate a healthy return on technology to reduce energy consumption. Even with clear evidence of savings they were not interested:
16 months to break-even was too long (unrealistic expectations of ROI on capital equipment)
their engineers claimed existing equipment would be damaged (too lazy to deal with new stuff)
"your product only works when demonstrating. Once installed for real it will not save." (abject lack of trust and fundamental failure to understand how stuff is made)
"how do I benefit when my school saves money?" (my salary is too low, if you help me I can help you)
When you add this approach with the 'preventative maintenance is for idiots' attitude to risk reduction, it does not surprise me that schools don't care about things that might happen. Only when it has happened will they take notice, and most likely only to say that it won't happen again. Schools here are run to print money as hard and as fast as possible. Protecting children is not a priority, whether short-term with tech like in the OP, or long-term by reducing environmental impact.
The school's owners, their COOs, and the owners of the vans and the company that operates them all should be held liable for failures. The six deaths mentioned should have resulted in 6 groups of defendants in court, then prison. The 129 near-miss events should have resulted in fines of hundreds of thousands of Baht. I'll stop dreaming soon...