I feel everyone gets a "Dumbing" when it comes to the Joker. And we all know why. It's because he's Batman top rogue.
Don't get me wrong, Batman is my fave hero on most days of the week, but even I cannot stomach how everyone has to fear the Joker just because he causes Batman so many headaches.
One of the side-effects of time never passing is that villains haven't escaped as many times as you think they have. That's not to say that any individual escape has been retconned, but somehow they add up to a much tinier number than you would think.
Somehow, someway, Joker has only been around about ten years and has only escaped a few times in those ten years. Somehow, someway, it's happened a small enough number of times that Batman still has real hope that Joker can be contained for good this time. And it's happened few enough time that cops still worry about ending their careers with an excessive force charge more than they want him dead.
The same magic math that stops Batman from getting old and dead also stops Joker's escapes and sheer volume of crime from getting completely ridiculous.
There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter.