Khandro - // Ghandi wasn't a high court judge, (& he wasn't a Buddhist) If he had been in the 1950s and had before him a person who had been found guilty by a jury of first degree pre-meditated murder, he would have had no alternative but to do his duty on behalf of the country & it's laws other than pass the death sentence, no matter how much he may have found it personally objectionable. //
If that post is directed to me - I didn't mention Ghandi, so I have no idea what his relevance is in your post.
// Humphreys did his upmost during his time to have the law of the death penalty changed, which eventually came into being, but not until 1973. //
My point is not that you can join the system and advocate change that goes against your beliefs - it is that you cannot join the system and perpetuate the actions that are against your beliefs, because while endeavouring to change them, you are still offending your beliefs by being a part of the system to which your beliefs object.