Do you teach this in your martial arts or self defence class?
How do you teach this attitude?
I'm no expert, but the first thing I'd suggest is the Buddhist non-judgemental approach. Don't judge. Judgements are so destructive and debilitating.
Secondly, adopt Plato's quotation: Be kind, for everyone is fighting a hard battle.
The man in the story is more of a 'man' than any physical fighter.