Despite the assertions of low abuse potential, the reality is that people
do become addicted to narcotic pain killers. Vicodin abuse is
massively widespread, you are entirely ignorant in this subject if you think otherwise.
When the original, "higher abuse potential" (read: safer) Oxycontin formulation was replaced by Oxycontin OP, addicts were driven to abusing high-acetaminophen narcotics anyway (attempting cold water extraction if they knew enough), or to more dangerous sources of a fix: black market original formulation Oxycontin or, often, street heroin.
No addict wakes up one day and says "Oh, my painkillers have acetaminophen? Guess it's a good day to quit".
Why? Because they are addicts.
Creating slow-releasing narcotic painkillers to reduce accidental addiction is fine. Removing all safe narcotic painkillers from the market damages addicts and is unethical. Oxycontin OP was not invented in a vacuum, it replaced the traditional Oxycontin in a misguided attempt to stop deliberate abuse (the differences are not merely limited to slower release).
Creating narcotic painkillers that are purposely deadly when abused is never fine.