this is basically what is happening with the AfD in germany. we let them have an audience, so they continued to spread hatred. and now they are getting voted into power, literal nazis btw.
Honestly they aren't much worse than the Ampel, one might even argue that they are better since they want to leave NATO. Problem is they probably won't do that even if they came to power because the US would just buy them all, doubt neo Nazis have any form of ideological integrity