Erm... your argument is all about evolution but there is no evidence that there is any.
I really hate to use the example because stereotyping = bad but, in LOTR there wasn't evolution. The three races were just created. Sure, I am glossing over details here but it is only to get a point across.
There's no evidence because it's a fictional world and we can't exactly go and excavate some fossil or artifact evidence. Man didn't start studying this stuff until Darwin, let alone in the middle ages.
I haven't read it, so I couldn't say. Though I'm guessing that's what their cultures said, as most cultures on Earth have a creation myth involving "just being created".
Did I say an ape just suddenly gave birth to a dwarf? No, I don't believe I did. Anyone who really knows what I am talking about should be able to infer that there would be stuff in between. But I can't say what because we don't know. I am one of few people that seem to really, fully understand evolution. But I've got to put it in a way those who don't will understand. And the cave adaptation argument makes no sense. If anything, that means that they are in a state between biological acceptance and denial of sun, which could be going either way (into/out of the ground). And apes do have beards, they have hair over just about their entire bodies. The hair of your body is all just regressive evolution of hair; we have lost a biological adaptation with little benefit.
DeKaFu also brought up another good argument for dwarf women having beards: all female humanoids wind up being designed to look attractive to humans, which is, frankly, sexist. Not to mention speciest. Why does the human shape have to be the look?
Fully understand evolution? I have yet to see one example of this fact. All I see are two simplified explanations without any further analysis to back them up. You should not have to simplify it, especially to me. If people don't understand it then that's too bad for them; they could, and should, learn something from it. I understand how it works, now please kindly give me the most detailed explanation you can muster.
I'm guessing your rebuttal for my cave adaptation implies that dwarves could have evolved from underground and slowly made their way toward the outside. To this I ask you if you've ever seen a primate living underground. There are but a handful of creatures adapted to surviving completely underground. There simply isn't enough food for a creature that needs a human sized brain (which dwarves have) to survive.
Apes have only a shadow of the beard of a man (or dwarf). They don't grow mustaches either. Also, we didn't lose an adaptation with little benefit; most land mammals have it. It just didn't help us when we started walking upright, as well as using our sweat glands. There are also arguments about it helping us swim, but that's not important.
One look in the raws will show you that:
[CREATURE:DWARF]
[BODY:HUMANOID:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:HUMANOID_JOINTS:THROAT:NECK:SPINE:BRAIN:5FINGERS:5TOES:MOUTH]
[CREATURE:HUMAN]
[BODY:HUMANOID:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:HUMANOID_JOINTS:THROAT:NECK:SPINE:BRAIN:5FINGERS:5TOES:MOUTH]
Humanoid. Human-like. They don't have to be completely attractive to humans, but bearded females is just not human. And by extension, not dwarf.
As for their acoholic dependancies, I believe that it's mostly cultural. With the invention of alcohol the dwarves started drinking it almost exclusively because of its sterility combined with its flavor and mood effects. After thousands of years drinking it their bodies adapted to it. Not much mind you, the only bad thing that happens from alcohol deficiency is slower working and some unhappy thoughts.