Let's not jump to conclusions. One of the surviving brothers had a BAC of .16, twice the legal limit for driving. The other brother had a BAC of .04, only half the legal driving limit. The dead victim had a .02. As for cannabis, the test only proved that they had ingested cannabis within the past 30 days. Yes, it does look like they were taunting the tiger (I always suspected this, as it seems the Tiger stalked them for a considerable distance, rather than attacking random zoo visitors). Nevertheless, the Tiger shouldn't have been able to get out. Unless one of the kids stuck his arm or leg down into the moat and only by grabbing it was the cat able to escape, the blame must be placed on the zoo, IMHO.
Bill, tgo