¿What is killing the otters?

Informed by the SORAC program I found this video. I was still sad from learning that in the last 10 years things have worsened with environmental concerns in the bay I care so much for, when I read about another spillage in the estuary of Avilés, Northern Spain, and another spillage -bad one- in Comodoro Rivadavia, Patagonia. ¿What is wrong with us humans?