Very sad; but unless toxicology reports indicate otherwise, an accident is just that, an accident.
No manufacturer is to blame. The state doesn't need a $1,000,000 safety sign campaign(that prolly wouldn't help), or any more wasted dollars in regulations and requirements.
Just pause for a moment and think about the families of the victims, and how their lives will be forever changed, regardless of the cause of the incident. Prayes for all involved.