I missed your response days ago, but happened to see it just now scrolling through my comment history.

It seems obvious to me that deplatforming them will further radicalize them. It fits perfectly into their narrative as I understand it.

Engaging them as (deeply flawed, very wrong) humans and having a good-faith debate seems to have worked shockingly well for Daryl. I suspect it could for others, too (though Daryl is obviously a rare breed).