Excuse me? Unabomber, Weathermen, Islamo-Fascists, Red Brigade, Shining Path, Symbionese Liberation Front, etc, etc.
There is nothing in their philosophical outlook which rules out murder. The only reason why they refrain from murder is pragmatic: they think murder might hurt the cause.
This is a tactical measure which could be revoked at any moment.
"...the Earth Liberation Front (ELF) and the Animal Liberation Front (ALF) are "one of today's most serious domestic terrorism threats."
Eradicate them then. period! They are not worth any effort or resource beyond that.
These Caucasian crazies will be used as an excuse to justify further restrictions upon our Constitutional rights, when the correct response would be infiltration and ideological profiling.