The normal rule of gunnery is to shoot, and then whatever you happen to hit: call that the target.
Does the same thing apply to carjacking? Armed robbery?
No. The goal of carjacking is to get a ride; the goal of robbery is to obtain value. Deciding to not fear it, does not deny your adversary his goal.
But terrorism is about persuading the survivors, the technically-not-victims. Nobody ever carjacks in order to get the next car to lock their doors. Nobody commits armed robbery in order to manipulate a third party (movie script counter-example: Die Hard, but the FBI was manipulated as part of a "Briar Patch" strategy, rather than terrorism(*)).
e.g. Not Terrorism: "Your tank factory and its workers are gone. This gains me a numeric advantage in next month's tank battle." Terrorism: "Your tank factory and its workers are gone. Surrender or else I'll wreck more of your expensive factories and kill more of your workers."
(*) Does this happen in real life? What believed acts of terrorism were actually not?