A good cause can become bad if we fight for it with means that are indiscriminatingly murderous. A bad cause can become good if enough people fight for it in a spirit of comradeship and self-sacrifice. In the end it is how you fight, as much as why...
Source: Disturbing the Universe, pt. 1, ch. 4, 1979.
-- Freeman Dyson, (Dec 15 1923-2020), English physicist, educator; He is noted for his works in the field of mathematical physics; professor at Princeton Univeristy, 1953-94.