Tim Carmody is correct:

I feel like we need a corollary to the Ad Hitlerem/Godwin’s Law fallacy. I’m going to call it “the Gandhi principle.” Just like trotting out the Hitler analogy for everything you disagree with shuts down a conversation by overkill, so do comparisons with Mahatma Gandhi, Martin Luther King, Nelson Mandela, Jesus, and other secular and not-so-secular activist saints.