What are the anti far-right protests really for?

I see that there is a problem people adopting/agreeing with/getting convinces by far right ideologies. But don't we need to change these people minds? I don't know if these demos change the minds of any of the people who need their minds changed. It seems to be more for people who already agree to feel righteous for a moment.

Don't we need to find a way to get through to the AfD people? We can't just have 30% of the country irredemable and demonised - I don't see how that leads somewhere good.

Happy to hear thoughs why I'm wrong or what I'm missing.