Art, you're right that the media exists only for the purpose of making money for their owners. They either parrot what they've heard/read somewhere else or they word things for the most sensationalism (to attract consumers).   But you'd think that would make them call this murder an act of "terrorism" too.

The FBI, however, also lists various environmental action groups as "eco-terrorist" groups -- giving them license, via the so-called Patriot Act, to spy on them, etc.    I wonder if they consider some of the extreme "Pro-Life" groups -- the ones that inflame their members to act out violently against "abortionists," whom they designate "mass murderers" -- Christo-Terrorist groups.

Yes, the "terrorist" label is more likely to be used for a criminal who belongs to a group which espouses a specific anti societal agenda than to one who is acting on his/her own.
But I think you'd be stretching a point to say that environmental and animal rights organizations have "antisocial agendas." They are not espousing the overthrow of the government or violence against people.   In fact, the environmental groups maintain their purpose is sustainability of human (and animal) life on earth.