The difference here is that this is not something that an intervention can fix, unless it could somehow compete with decades of cultural interactions and signifiers from billions of people. It's not a case of containing anything: that's essentially an anthropomorphization similar to seeing evolution as having intent. That is why the idea of wanting to educate people in the hopes of enforcing "correct" wording is fundamentally flawed because it has almost nothing to do with how words actually change or stay the same.
The prescriptive/descriptive discussion doesn't mean much to me (although DFW has a great essay on it if you are so inclined). I just wanted to throw my 2c in with the guy being downvoted, because I think he's right. I think the extent of Average Joe's historical knowledge is basically whatever Hollywood has made movies about. AverageJoe thinks that the Nazis are Nazis, and Fascism is a more generic term which contains the Nazis and other 'far right' groups.. and who knows, maybe _it is that_ now, but lets be honest how we got here - that nearly everybody, even the most vocal 'anti-facists' are historical ignoramuses. They think that by merely existing they have the necessary information to assert their opinions on historical/political movements. It's a joke
It's certainly not the same as with Fascism and I would probably agree with the OP in this thread that the main is reason is that while people have seen plenty of movies about Hitler et al, the same can't be said for Mussolini. The Italian origins of the word seemed to have been lost largely due to historical ignorance..