Earlier quoted context omitted.
Set the do not track flag if you trust website owners to actually listen to your request. If you don’t trust them to listen to your request, then being forced to manually tell every website you visit not to track you is obviously pointless and worse.
It’s easier to trust a business to follow a law with teeth than to follow a mere non-binding header that politely requests the same thing.
One might be forgiven for assuming that the law was actually intending to accomplish the reverse of the stated goal. It gives site owners tons of explicit opt-ins that nobody can complain about, even though they were coerced.