Argumentum ad Hominem.
Argumentum ad Hominem. "Oh, Joseph! Teddy's just been bitten by a strange dog! Doctor says we'd better take him over to Pasteur at once!" "But my love, I've just written and published a violent attack upon M. Pasteur, upon the score of his cruelty to rabbits! And at your instigation, too!" "Oh, heavens! Never mind the rabbits now! What are all the rabbits in the world compared to our only child!"