"The company should have known the lack of a flame arrestor posed a “tremendous and horrific risk of injury,” the lawsuit claims. "

One could certainly counter that claim by saying the parents should have known the tremendous and horrific risk of injury of allowing a can of gas to be readily available to a child.  And, if the risk of using cans lacking flame arrestors is such common knowledge, why weren't they using a can so equiped?

Besides, we all know if the child wanted to get gas on that fire bad enough he would have figured out a way to empty the gas into another container and then splashed it onto the flame and probably done even more damage.

No one takes the blame for thier own actions or lack of common sense any more.