My suspicion is that you can't really neuter a romanticist movement with the logical application of steel and lead. You are almost always guaranteed to have this minority position exist among some portion of the population.
Granted, you can always some crackpots who'll claim to believe anything, up to and including that mankind is really being controlled by a race of giant space lizards, but you should be able to prevent lost cause-ism from having any noticeable impact on the cultural mainstream.