Many materialists argue out of both sides of their mouth when it comes to consciousness.
On the one hand, they argue that consciousness is the key to dignity and the right to life. See, for example, the arguments of Peter Singer, who argues specifically that there is no ethical problem in killing an unborn baby because the baby at that stage of development is not self-conscious.
But then materialists turn right around and argue that consciousness is ontologically meaningless, asserting that it is nothing but an epiphenomenon of the electro-chemical activity of the brain.
Well, which is it? Is consciousness absolutely crucial, literally a matter of life and death, or is it the essentially meaningless byproduct of chance and necessity?