Excellent point. While those of us with nominal color vision consider those who cannot see the world reflected with the equivalent contrasts and delineation as color-"blind," that term does have a built-in prejudice. Rather than classifying the lack of nominal perception as blindness, these conditions might be better understood and accepted if the possible enhancements afforded these differing perceivers have were noted instead.
However, to the question of the morality of treating, or changing their visual perception to a more nominal state, let the individual choose. They know better than nominal viewers how they can and cannot compensate. The only fault with that decision is that it's likely not going to be a fully informed choice.