Have you a better method than mine.
Or Daryl Davis's?
I've had much practice negotiating with hostile
parties in real estate, eg, renters, buyers, sellers.
Set ego aside. Approach it methodically.
Ask oneself, what would best make the other
side amenable to an acceptable agreement?
Are you saying this approach can be good when engaging people who have violently hateful beliefs, or are you saying that everyone is obligated to adopt it?
If the former, I have already expressed agreement with it for some situations. I also do it myself with a lot of people including fundamentalists who believe people like me should be killed.
If the latter, I disagree for the reasons I already explained. I don't believe that people are obligated to placate or try to change their haters or abusers.
Also, the groups of people you listed are a far cry from murderous or genocidal neo-Nazis. Not sure this even needs to be said, but it makes your point less applicable to certain types of people.