Thousands of dead from one man. One quick snap and that’s the end of him. No more Smilex. Hell, even Harley wouldn’t be against it anymore.
Joker is insane, he can’t be held accountable for what he does, (Probably the only thing that keeps him off the electric chair) but if prisons can’t hold him, how many more would it take before batman finishes him? Look at it this way, if Joker was sane, for only two minutes, and thought back on what he'd done, then he'd probably hang himself.
There are ways when you can do what Batman can.
You don’t want to kill? Fine, let the powers that be do it, have his case transferred to a state with the death penalty. I figure it'll take an hour for him to fry.
Death isnt justice? Karate chop to the spine and Joker cant to anything but spit at victims ever again.
You want imprisonment instead? Fine. Put him in cryo-freeze, put the chamber at the bottom of the ocean.
Something a little more definitive? Have the JLA build a cell on Mars or something, with one-way transporters to send him bread and water. You don’t even need guards.
There are ways.




