The lessons will lose their potency not because of comparisons like these but because most people don't particularly care about history and don't want to expend the effort of knowing history as opposed to other things they could be doing.
Usually, mentioning Nazism doesn't work well due to the way it invites flame-wars, to the point where Godwin's Law is well known. However, the specific irony they mentioned is in fact a valid observation: pseudoscience used by the state with grave consequences. I am saying this even though I myself have a strong pro-Israel bias.
Asimov mentioned this idea in a discussion with Elie Wiesel with reference to the treatment of the Edomites as described in scripture. It's an argument that has more to do with exploring the nature of political power itself than to demonize a specific group. It just so happens that in this case we have a group that has experienced one of the most poignant extremes of this phenomenon, hence why it comes up often.
Is the spotlight often placed repeatedly and with unfair frequency on Israel? I personally think it is. But that doesn't close off the topic on its own.