I tend to agree with you and I understand.
I am sure people do not do it to offend Jews, nor to minimize the horrors of what the Nazis did to the Jews -- but one can hardly miss the parallel in attitudes, such as "it's legal, they are only following orders" and so on.
And remember all the appeasers in Europe, who didn't think Hitler would ever really do what he eventually did.
Using the Holocaust as an analogy overplays our hand. It is a turn off to those not as committed to Terri's cause. Nazi analogies can be used in many cases. There are often parallels. But his is not Nazi Germany. Not even close. We do not need to invoke it to make our case. It's better and more effective if we don't.