Debate has never been an effective method of challenging Nazi ideology but in some cases (undeserved) compassion can be effective in moving people towards deradicalization

That being said, your first and foremost responsibility is to protecting the vulnerable. If you are in a position to help someone deradicalize in their personal life that is good, but it is morally wrong to allow people to be subjected to their ideology (both its violence and rhetoric) and inadequately protect those people, or simply challenge their ideas verbally dragging vulnerable folks through exposure to hate and dehumanization

I think its also important to remember that while deradicalization is a good thing, it is unbelievably emotionally laborious and never a guarantee, and can only ever work at an individual scale. I don't think you could just "hugs and kindness" your way out of the Nazi regime. It is not a meaningful way to solve the larger problem