No, no, no!
Just because someone is terrified, does NOT make it terrorism, however many times the American media and politicians say ao.
By your definition, if there is a serial rapist working in an area, he's a terrorist, because until he's caught, women are terrified to go out.
The mad nutjob in Las Vegas... wasn't a terrorist.
Dylan roof was sorta trying to be a terrorist, but was really just a murdering racist arsehole.