Scans_Daily

I would argue that Zsasz might well have been sent to Arkham on a successful insanity defense. Remember, Arkham isn't merely a rehabilitation facility, it's also a place for the incarceration of the criminally insane who *can't* be rehabilitated. So Hugo Strange would possibly qualify, and, as I said, Zsasz almost certainly would. It wouldn't be out of place for Johnathan Crane to go to Arkham, as well.

Beyond that, one could argue that Arkham could be better suited to providing the sort of physical environment required for certain patients with special medical needs, such as Mr. Freeze and arguably Ivy (who canonically needs sunlight and CO2 to survive). With the smaller population, it would certainly be *easier* to provide such special facilities there, which would also make such a "prison wing" at Arkham a very attractive option for the incarceration of, say, Killer Croc, who would require specially reinforced accomodations to hold him.

As for Joker... I would expect that one of these days, a cop would just blow his brains out "resisting arrest" and put an end to it all.