The ultimate irony of Kreese's "No Mercy" philosophy and his final ending

Kreese lived by the code of never showing mercy and never showing weakness.

However, it was only by finally showing vulnerability and compassion towards Johnny and Tory that his dream of making Cobra Kai live on finally came true.

Sure it's a TV show, but there's a good message to take away: it's never too late to put good out in the world, and you can bet good will finally come back to you.