Uh-- pilot? Without necessarily disagreeing with your underlying point, can we maybe not overuse that word? Terrorism is a strategy of the weak against the strong, a method for forcibly drawing attention to a cause, usually a pretty desperate one. It uses fear as a weapon because it largely lacks other strategic weapons.
The Triglavians, ah, don’t. They inspire a lot of fear, sure, and civilian casualties don’t seem to bother them much, but their situation’s more in line with the old joke about what a fifty-meter squid does: anything it wants.