To summarize: if you want to offer yourself as a target, there needs to be a bulleye painted in red on your chest. For all to see. Otherwise, you're not offering yourself as a target.
I disagree. This would likely be the case if you lacked the ability to mark, since you would then want to present yourself as a viable threat, comparable to a more fragile target such as the party wizard or rogue, and the 3e fighter's largest shortcoming.
But now that you have caught the foe's attention and know that he now has reason to want to attack you (or risk suffering the penalties from divine challenge), it certainly makes sense to me that now is as good a time as any to make yourself as hard to hit as possible.
I personally feel that divine challenge is there simply to let defenders do their job by giving monsters a credible reason to want to attack them over anyone else (normally, between a PC with high AC and tons of hp and another PC with lower AC and less hp, the choice is obvious). Presenting themselves as a big honking target is one way (and possibly the most common because that would be the most obvious way to build a paladin PC), but certainly not the only way. I believe that divine challenge was deliberately worded the way it was exactly to allow just enough wriggle room for alternative paladin concepts (which is likely why the paladin code was not reprinted), such as an elven bow sniper, and so that you did not have to be pigeon-holed into the role of meatshield.
For instance, it is possible to build an elven cleric archer that is best decribed as a striker/healer/buffer hybrid. Is it that hard to admit that a striker/defender version of the paladin may well be a viable character concept?
