Right, well it's one thing when posting on HN - I'm not really running a spelling and grammar check. That said - my complaints are not around their writing style. Many of them are non-native speakers and I can live with bad grammar & spelling in comments. The pain-point is really the coding style that leads to bugs where they could have easily been avoided.

I do get your general point of leading by example though - and like the idea of "show them whats wrong instead of just telling them by fixing it in real time".