" Ecologist Paul Ehrlich stressed that people who hold opposing opinions need to engage in open discussion with well-reasoned dissent. Positions should be questioned and criticized, not the people who hold them. Personal attacks preclude open discussion because, once someone is put on the defensive, fruitful exchanges are impossible, at least for the moment. "

― Marc Bekoff , Why Dogs Hump and Bees Get Depressed: The Fascinating Science of Animal Intelligence, Emotions, Friendship, and Conservation