While I'd say anyone ruling out man made causes of these whales' deaths would be demonstrating severe cognitive dissonance, isn't it equally likely to be a disease or something not man made? Why does every bad thing that happens have to be caused by man? They could have a virus that jumped to them, something along those lines, just like out pandemic (which, I've heard, is not man made, and about the only problem plaguing this earth that people are adamantly sure isn't). There are literally millions of other species they interact with besides us, many of which could cause this.

Maybe do the science before we jump to conclusions?