I've refreshed the 'Obit: Sam Smith's and live music' thread so you can see the history.
In a nutshell, you are right that aggressive letters will not change Humphrey Smith's mind. But, unfortunately, neither will polite ones as we have already sent them.
Nick, another mudcatter, even had a call at home (after his second letter) from Humphrey Smith which politely told him that he would not discuss the matter anymore.
We're not dealing with a reasonable man here!