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.
It may happen, but it will never be anywhere near as common as cat theft.
One is safe, trivial, fast, and pays a lot. The other is extremely difficult, possibly lethal, and can’t easily be melted down for profit like a cat.
Now what? How do you get it into another vehicle to transport? There's no place for a small crane to attach to. You would need some sort of hydraulic lift that would be similar to a pallet jack. Once it's up you then need to move it onto the truck which would be difficult. Maybe you can drag it on the back of a truck using a pickup bed mounted winch.
Finally what do you do with it? It's nearly impossible to remove the individual cells, they are incased in some sort of protective foam that you have to chisel out. Sell the entire thing? Tesla will know the battery is stolen, car reads the serial number, bam, back to you.
Not to mention how large it is, how many could you do in one night?
More importantly why did you make your post? Do you have EVs so much that anytime even a slight advantage comes along you have to dispute it? Maybe you just like to argue. It's just really weird.