It's interesting enough. However, I don't think the author realises that most people don't worry about what the ingredients in shampoos will do to their health, but mostly what they will do to their hair. He also did not address what they would do to the environment.
So yes sulphates aren't going to give you cancer or anything, but I think it's perfectly reasonable to not use them if you find they make your hair dry and your scalp itchy.
I don't think anyone on here is freaking out about chemicals in shampoos and running around screaming "we're all gonna die because of Polyquaternium-10!!!!". But some people are fussy about what's in their shampoo, which is perfectly justified.
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