> your body needs a fair amount of carbs every day, and people are cutting bad carbs without replacing them with good carbs, and thus experiencing an inescapable craving for carbs.

Not true. While it might be true that your body (e.g. your brain) needs some glucose, this can easily be synthesised by your liver from fat as required once you have been running on ketones for a few weeks. You do not need "good" carbs to survive.