You have to keep refuting it for each new generation just like you have to teach each new generation the law of conservation of mass despite it having been proven over and over for centuries.
Then it is clear that the idea that the marketplace of ideas will simply defeat evil is a fraud. We will have to spend literally forever publicly arguing that it is a bad idea to murder everybody belonging to a given race.
We don't have a "marketplace of ideas" for alternatives for the conservation of mass. We teach kids one thing in school and move on. Why do we behave differently for other topics?
We don't have a "marketplace of ideas" for alternatives for the conservation of mass. We teach kids one thing in school and move on. Why do we behave differently for other topics?