TFA spells out why this is wrong better than I could.
> There is another important aspect of this configuration. It was opt-out, not opt-in. A user did not have to actually use Docker. The security tradeoff was made for them, applied to the default account, and the tradeoff was not explained to the user.
> Security-sensitive defaults matter precisely because many users reasonably assume that the operating system defaults to secure and will inform or prompt them to opt-in to less secure settings.