Had you actually read the OP, you'd have understood that the crux of the criticism has to do with mindless participation in an obviously bad system. That is, a system that turns a necessary but easily abused task into a profit center - thereby ensuring that it will be stretched to utterly unnecessary proportions.
It had nothing to do with hunting in general, or being a vegetarian in particular.
For the record, there's (a lot) more to the issue than a few meals. Even in the limited areas where elephant populations are not highly endangered, there's still substantial controversy around any practice that allows the ivory market to legitimately revive itself, since it not only provides cover for black-market ivory, it also fuels the kind of demand that leads to increased poaching in places where elephants remain truly endangered.
You should also know that what you saw on that video is the exception, not the rule. In the all-too-common cases where elephants are killed illegally, any stray documentary crews would also be killed, with all the bodies left to rot. The same goes for rhinos, tigers, and other magnificent creatures unfortunate enough to have one or two body parts valuable only to chronically egotistical douchebags.
Assuming that being thoughtful enough to read isn't too much trouble, you can start to educate yourself by considering this: http://www.ifaw.org/ifaw_international/save_animals/elephant...