Even Martin Luther was pardoned after death ..oh come on now..
In the case that you're confusing Martin Luther, and Martin Luther King, MLK was also not convicted by the British government of anything, and as this is a British government policy, I'm a little curious as to what relevance you feel this has on the discussion at hand...
…but lets not get into that—the last thing HN needs is another religious debate alongside those of iOS v Android and Node.js v everything.