Some people kicked back on the tweet thread asking, “Why should basic decency be applauded?” These encounters are not examples of brilliance; they are examples of good practice, and shouldn’t be held up as something special.
Because that’s how a society works. Disapproval – from physical chastisement to a raised eyebrow – of things we disapprove of and praise and celebration of those we approve of. Reinforcement of the behavioural patterns we collectively desire.
Exactly the phrasing or action used to reinforce doesn’t matter so much. Some societies use a ticker tape parade to show that approval, others just a muttered well done that man. It’s the same incentive to the behaviour either way.