Those who deny the holocaust ever happened or if it did, that it wasn't as bad as the Jews make out are inviting that same danger to occur again.
Adults say to children or animals "Come here, I'm not going to hurt" because they want you in range and are not only trying to stop you running away but actively encouraging you to come closer, so that they can abuse your innocence. This happens on the larger scale too in society and this is the danger with holocaust deniers - mind games you have to be aware of and on your guard against.

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Author of 'Empty Thoughts from an Empty Head' and other trivia including 'Logic Lists English, the cure for illiteracy (allegedly)

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