Earlier quoted context omitted.
Only some of them. The transient orca are the ones who eat mammals and don't have large social groupings. The resident orca have larger (matriarchal) social groups and don't eat other mammals , just fish. It's always amazing to me that we have multiple intelligent (how intelligent is uncertain), social species right here on our own planet, and we spend such a tiny fraction of our energies as a society trying to commu…
Your comment and the parent really surprise me. Passing such moral judgements based on the diet of a species seems a bit 'youtubish'. Using the same logic one could argue that humpback whales are the real assholes since they protect those seals and sea lions so they can prey on those tiny, little penguins which are the cutest. (Seals even rape them :'( http://www.bbc.com/earth/story/20141117-why-seals-have-sex-w... )
Causing harm to social intelligent species, such as by eating them, is objective. In theory another species could eat plants and also attack mammals for fun all the time. That species would also be assholes. This isn't a judgement based on 'diet', it's a judgement based on how they interact with others.
> since they protect those seals and sea lions
That's not the same logic. The same logic might lead you to call seals and sea lions assholes, but it wouldn't extend to the whales.