Unorthodox wrote:
I think that Godwin's point wasn't so much that Hitler or Nazi comparisons are invalid or irrelevant, but rather that they are stale, cliched and overused, and his "law" humorously illustrates the point. I wouldn't say that someone who makes a Nazi comparison is automatically wrong per se, but I'd definitely think they were unoriginal at best.
Perhaps it isn't such a fallacy, but rather just an outdated usage. Though the statement of "if Hitler tried it, it might be a bad idea" still has some humor value, it is rather old.
More properly, and generally, such a thing could be stated as,
(1) This dictator has little or no regard for human life.
(2) If this person performed an action based on their valuation of human life, then it might be a bad idea to try it.
(3) this person performed euthanasia of those he considered to be unfit.
(4) it might be a bad idea to try euthanasia.
Not just due to association, but due to their regard for human life. I'm probably stating this poorly though, as I am quite tired.