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I could see it being natural within the turks since they have less dominate hair color genes (browns and other lighter colors are more common).
Valid points but the important point in this case is that gene's origin is specifically from ireland. So naturally as with any gene it is highly concentration in and near ireland and becomes statistically more rare the farther out you go.
So while they are absolutely able to carry the gene they are unlikely to have it for that reason, and even they do it is unlikely to actually express itself because dominant genes mast it, as dominant genes do.
Red hair isnt a gene for the lack of melanin, that would be albinoism and that looks very different.
Oh and one other thing I forgot to add. It very much has something to do with other hair color as well. The MC1R gene encodes for the melanin in hair and skin and can determine if a persons hair is blonde, black, brown, or red, though it isnt the only gene involved in determining the aesthetics of your hair. But it is very much related and not a separate entity.
i don't think asia is low-light enough for that adaptation to have ever been important though.
scots-irish on the other hand live under the heavy rain cloud of imperial depression