After some reflection on this, plus reading the strong, credible warnings given about the dam before it burst:

I blame environmentalists for a significant portion of the disaster.

Those nitwits run around protesting everything at full volume, so that we and the public and government regulators begin to ignore them like we would a boy constantly crying "wolf!"

Somewhere amid screeches at news conferences about tainted toenails on snail darters and soiled hair on white Kermode bears, there were environmental concerns about a vast lake impoundment of arsenic held by a dam on the verge of bursting with no back-up plan.

It angers and annoys me to see such important environmental concerns lost in the blizzard of micro silliness.