"You started out to prove that Simpkins is a meddlesome ass.
You've got half way.

He's certainly an ass.

Didn't he know that Doyle was chairman of the Board of Guardians ?" "He must have known that, of course." "Then he's an ass.

No one who wasn't an ass could possibly expect Doyle to pass a vote of censure on the doctor for not prosecuting him about his drains.

You needn't elaborate that point further.