My head hurts

From Sea Shepherd:

The Taiji fishermen know that while Sea Shepherd crew remain in the area, they can not commit mass murder of dolphins without it being documented and being further exposed in the media, a major form of embarrassment in Japanese culture.

Hmm...

From Dictionary.com:

Murder n. The unlawful killing of one human by another, especially with premeditated malice.

From hyperdictionary.com:

Murder n.unlawful premeditated killing of a human being

Mass Murder n.the savage and excessive killing of many people

While some other definitions don't include "of humans" those are all literary uses of the word... Don't think these guys are on the same level as Shakespere.

What is the difference between "to kill" and "to murder"?

(Also those pictures are absurd)