I think the “Nosedive” episode on black mirror addressed this idea.

Yes, but only on a case by case basis and at really weird times. Just walked into Walmart? Give the greeter your left shoe, but just you no one else has to. Next guy at the gas pump filling up? Cash payment and pants for his petroleum blessing. Wendy can’t sleep? Time for her to gift her mail to her neighbor, how nice.

As for the why. Just for funsies.

Punishnent for refusal? Anxiety about not performing the action. Works on OCD people. I can’t imagine the global population will resist for long.

Of course. I, as their Nice™ Benevolent Dictator, would decree that Niceness™ is hereby law. Our Niceness™ is enforced by our Not-so-Niceness™.

Like no. Some people are insufferable a-holes and wouldn’t respond to forceful change. It’s better to lead by example IMO to try and be nice myself to hopefully sway a mind here or there.

Nice to who?

I would try to make the justice system function as intended. Keyword is ‘try’ as it’s not simple or easy