Renown as the best science high school in Thailand, this school seems to have highly competitive and stressful learning atmosphere. As a result, many jump into conclusion that this might be the cause of the tragic incident.
However, we could not exclude the pressure from the society and their families. Most high school children are programmed (like robots..
what's a pity!) to get high scores in entrance examination in order to have a seat in a prestige university. Moreover, in this case, his parents cannot
deny their responsibilities of taking good care of their own son when he had stress. Students have stress and spend too much time in tutorial schools. ( I'm so glad it passed and there will be no more video lesson from any tutors in my life!) They should relax as solar cell have mentioned...
It's a sad story.

Children sometimes think only in a short run on how to get rid of their stress without thinking
of consequences. Positively thinking, there is no loss of life. Building and learning materials could be rebuilt and set up later.
I do agree with you on all accounts! Great writing CoffeeBreak. Allow me to correct some mistakes.

1) "What a pitty."
2) The meaning to the phrase here is quite hazy. Perhaps this is what you were trying to imply. "His parents shouldn't have neglected his son" OR "His parents must be responsible guardians by taking good care of him" OR "His parents must be responsible for the incident because it was a result of their negligence". Please correct me if I'm wrong.
3) "without thinking about its consequences"