Sad to say, a lot of people's barometer of plausibility correlates directly to what Chris Nolan wants to use in his movies. Clearly, Nolan's first consideration behind every stylistic choice is not always its believability. To think otherwise devalues him as a director.
No kidding. There is this attitude that realism is an end, rather than a means to an end. In truth, it's only useful so long as it serves the story that is being told. What that means is that the creative decision process does not go "A man dressing as a bat isn't realistic, so I won't use it, but rather "I've got a man who dresses up as a bat, so how can I dress that up so it seems less ridiculous?"
This is why we still have sci-fi body-armour, fear gas, secret glider capes, leaping tanks, ancient ninja enclaves, and magical microwave emitters. If Nolan's standard was realism, he would not have let any of those pass. They served other purposes, and they were dressed up realistically after the fact.
By similar token, describing the Joker's make-up as a decision driven by realism is almost certainly a mistake. That would be a pointless alteration that serves
nothing. Obviously there is
something else driving this decision, a larger consideration for something Nolan wants to adjust in the Joker's character, something he wants to communicate about it. I'd wager it's about making the Joker a more direct product of what Batman has introduced to the world--instead of Joker being created because Batman chased him down a chemical plant, the Joker was created because Batman introduced an
idea to the world, and like all ideas it's been taken and corrupted by someone else. You have to consider the magnitude of what Batman did. It's decribed in Joker's line; "You've changed things, forever." Batman
broke the rules that society operates by--and I just don't mean the law, I mean our
mentality, our understanding of what is reasonable, appropriate, and what is
possible--how we respond to the world. He opened a door to a whole new way of thinking, and now other people are going to walk through it, and use it in ways he didn't intend. The Joker is created because the mentality of the world is changing, not because a series of unfortunate events in his own life.
If Nolan wanted to communicate something that was served by bleached skin, by the classic origin (such as the elements I've described ad nauseam in this thread) he would have done it. He would not have said "Oh, that's not realistic, so I won't bother with that thing I wanted to communicate." He would have simply found a way to give in the appearance of reality, as he did with batpeople, fear flowers, leapfrog tanks, mad scientists, secret ninjas, and gliding felt.
People frequently say that make-up should be accepted because it's only superficial, that it doesn't affect the character. This doesn't follow. If that were true, that would be a fantastic reason to
hate the decision: it would serve no purpose, it would worthless change for the sake of change.
It was done not for the sake of realism or anything to superficial, but to shift something about the Joker's nature and the nature of how he came to be, in order to serve the story. My extrapolation of what that reason
probably is, described above, is enough for me, and it intrigues me, but of course I could be off. In either case, accepting the alteration is not a matter of saying "Oh, it's just his face, he's still the same," or "Oh, it's more realistic." These reasons are nonsense: they do not describe the purpose behind the choices, and they are not sufficient reason to accept
anything. What should be considered is whether the idea Nolan is trying to communicate is more, less, or equally preferable to the ideas that are communicated by the classic origin, by the standards of the individual watching.
We know my decision, since it is described above, and a dozen times throughout this thread. Of course, my decision may change, if it turns out my theory on the purpose of the alterations turns out to be false.