EV batteries are becoming STRUCTURAL, meaning they make up the core vehicle shell of the car, use hardened steel reinforcement and weight 1-2K pounds. They're also super dangerous if punctured. It would be easier to steal the whole vehicle than to steal the battery alone.

I'd go so far as to say that an EV is a glorified "battery with wheels" since the actual drive components are a minority of the weight/complexity/cost. If a criminal can steal the whole EV, they will, if they cannot then stealing the battery alone isn't realistic.