So starting in 1983 that's roughly five conversions a year assuming the figure of 200 people in the article. So a 1,000 years to get through all 5k members according to bruceb's post. The man is a legend but it goes to show how difficult it is to deradicalise people who are deep in an ideology of hate. Something relevant to think about with things going on around the world right now.

Stopping people from going down the rabbit hole in the first place is really the only viable long-term solution - easier done with individuals than entire communities sharing that ideology as the norm.