The hair is not evil, it's simply "risky". And mind you Indians are not "evil" in any way shape or form. The reasoning is simple: if you go to such great length to preserve your "purity", you may as well go an extra step, and pay a bit more for a wig that's guaranteed to be idol-free.

It may generate some more income for wig makers, some less income for Indian women, but it's not such a moral outrage. Just a bit more sophistry from people famed for it.