The voice continued, "We do not think well of your people. They end life. They eat meat. It is bad to be intelligent and to eat meat. One who eats meat must end life to live, and an intelligent meat eater does more harm than a mindless one since he can think of more ways to end life. You have little tubes that can end the lives of many at one time." " But we do not kill V-frogs. " "You would if we let you."
— Lucky Starr and the Oceans of Venus by Isaac Asimov (Page 114 - 115)
An unexpected speech from 1954 in favour of vegetarianism!