I never was really into comics as a child, and I think if you miss the boat when you're a kid, you don't necessarily pick up on it when you're an adult.
When should we nudge and when should we shove, I think, it's a political judgment. Obviously in some situations we need shoves, we need laws. Fraud is against the law, murder is against the law, drunk-driving is against the law. We don't need just nudges.