I agree with you 100%, but to be ideologically consistent, we should admit that websites have as much of a right to ignore Do Not Track as we have to ignore their tracking scripts.
Not if it comes from "consumer protection", as opposed to "your computer, your rules."
Treading down the latter too far leads into weird realms like "Hacking? I didn't make your computer do X, I simply sent it messages, it's your fault for not controlling its behavior."
"Rights" are sort of a hollow concept compared to how society ought to function and are just a crappy workaround our society's inability to resolve basic conflict.