Why is this Ferocactus pink?

[Brontosaurus]

It's a F. townsendianus. It's obviously not in the best health but the color is really weird.

[Brontosaurus]

I should mention that the flesh is still firm to the touch, but not hard like one would expect if it was dying.

[Grimm]

My guess is that it is close to death, and the green chlorophyll have died off leaving just the red pigments, like the leaves of a deciduous tree in Autumn.

[7george]

Too much sun or heat? How the roots are, these look weak for me.

[Brontosaurus]

I don't know if this will work, but I tried grafting it to see if that would help it.