Why do people always jump to Nazis when discussing free speech issues? Seriously. Why do we have to compare every unpopular minority to the literal Third Reic

Why do people always jump to Nazis when discussing free speech issues? Seriously. Why do we have to compare every unpopular minority to the literal Third Reich? Yes, many minority groups are absolutely terrible and deserve the contempt they get. That absolutely includes Nazis. However, many minority groups throughout history - ones who weren't advocating for genocide, eugenics, and world domination - have had to fight against oppression to have their voices heard. Like it or not, what is ethically acceptable in a society is determined by popular consensus. Abhorrent ideals can, and have become acceptable by virtue of simply being popular. Our consensus should be challenged and evaluated regularly. If we truly are right, we should not be afraid of having our views put to the test. Besides, if you don't expose people to alternative opinions (even terrible ones), then you never have a chance to adequately explain why those opinions are wrong. If you teach someone that something is right or wrong and never fairly address points from the opposition, that person is going to be relatively easy to convince otherwise. We see that happen with people in political parties all the time. Someone grows up a staunch believer in a particular party's ideals, then suddenly flips when they are put in a position to consider the other party's points. Simplifying the issue to "Nazis wanting to speak about Nazi shit" is extremely disingenuous.