"extremism" and "terrorism" are such meaningless words, aren't they?

What's extreme to you is normal to another. You think the burrkka is misogynistic, while an arabian Muslim would think a woman showing her ankles is extreme and radical for their culture. At the end of the day, "terrorism" is another cop-out word. Shouldn't we want people who do wrong to feel terrified? Don't we admire superheroes like batman in our movies, who essentially use terror to manipulate criminals into thinking twice? I am an extremist terroristic; I am extremely good, and as such I terrify evil.