[einpoklum]

1. Because most people fail a lot in a lot of things.

2. Because failure often doesn't depend on you, and extremely often is at least partially dependent on external factors and context.

3. Because it's not that useful (psychologically) as opposed to other engagement approahces.

4. Because it can and will be misused to punish those who are disfavorable to the punishing establishment.

and last but not least:

5. Because the social systems which need to be in place in order to punish failure, and the ethos necessary for the punishers and for legitimization of the punishers' concrete acts, are themselves repressive to the general populace and make life a worse experience for everyone.