Lecture? Not sure about that, but use your own words I guess.

I would repeat, however, that the "broad brush" is a dangerous weapon. I would no sooner suggest that all Indian fishers waste chum salmon carcasses than I would suggest that all sports fishers are snaggers, or flossers or whatever description you would like to use.

Not all tribes fish for chum and not all tribes allow their fishers to harvest just the eggs.

Also, simply complaining about what is seen is not enough. Contacting the proper authorities is always the best approach, even if that broad brush of "those Indian police never do anything" is waving in one hand... you still have the other to look up the appropriate phone number and dial. But that is just a suggestion.