I respect those who come to their moral beliefs after much thought and bring conviction to their conclusions. Line drawing gets very complicated. One decides not to eat meat, but animal products are so pervasive, even in our modern society, that animals are still being used in so many ways, right down to the glue that holds the books together that advocate vegetarianism.
And certainly ethical behavior in support of ethical behavior is a better stance than an attitude of "I'm right so the end justifies the means."
It is very very rare that the end justifies the means. The only clear example I've run across is the assassination of Heydrich, who was masterminding the extermination of Central Europe and was killed by Czech partisans. If Heydrich had lived the Third Reich would not have fallen back on the inept leaders that eventually brought it down.
And yes, Heydrich was a Nazi.