How is that splitting hairs?
You say "you can't afford to be positive", but there still clearly are opportunities to be positive.
And either way, you don't get chat restrictions for not being positive enough, you get chat restrictions for being too negative.
Thus chat restrictions aim to teach people not to be negative anymore rather than being more positive.
(Or if you prefer that interpretation: They aim to restrict peoples' ability to be negative, not make them be more positive.)
And that's important; behaviour isn't arithmetic. Positive behaviour and negative behaviour are neither mutually exclusive, nor do they cancel each other out.