It tells you he didn’t care because he didn’t have to care. It tells you it was ‘his’ seat whether or not he responded to your letters.
If Dick gets on ‘Australia All Over’ each Sunday morning and starts promoting someone against Warren Truss in Warren Truss’s seat, because the government isn’t requiring ATCers to wear pink tutus, ATCers will end up wearing pink tutus. It would clearly be ‘in the public interest’ for them to do so.