The intelligence scale is problematic, primarily because of its implications about the relative status of humans with severe retardation and, say, pigs. That's a hard line of argument to swallow...
As for the dolphin video, the killings looked somewhat inhumane to me. There surely was a period of great pain during the course of the dolphins being removed from the water and brought to the warehouse where they were killed. Had they taken the dolphins out of the water and immediately shot them in the head, I wouldn't have a problem with it. Here, however, the specific execution of the, er, execution struck me as somewhat less than ideal...
In principle, I don't have a problem with the killing of dolphins, but it must be done in as painless a way as possible.
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The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error. ~John Stuart Mill, On Liberty
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