Sri Aurobindo
Letters of Sri Aurobindo
9. Fate and Free-Will, Karma and Heredity, etc
[Re Vivisection:] I feel inclined to back out of the arena or take refuge in the usual saving formula, “there is much to be said on both sides”. Your view is no doubt correct from the commonsense or what might be called the “human” point of view. 
Krishnaprem takes the standpoint that we must not only consider the temporary good to humanity, but certain inner laws. He thinks the harm, violence or cruelty to other beings is not compensated and cannot be justified by some physical good to a section of humanity or even to humanity as a whole; such methods awake, in his opinion, a sort of Karmic reaction apart from the moral harm to the men who do these things. He is also of the opinion that the cause of disease is psychic, that is to say, subjective and the direction should be towards curing the inner causes much more than patching up by physical means. These are ideas that have their truth also. I fully recognize the psychic law and methods and their preferability, but the ordinary run of humanity is not ready for that rule and, while it is so, doctors and their physical methods will be there. I have also supported justifiable violence on justifiable occasions, e.g., Kurukshetra and the war against Hitler and all he means. The question then, from this middle point of view, about the immediate question is whether this violence is justifiable and the occasion justifiable. I back out.