The signs have actually been there for as far back as I can remember:
-I actually knew one mentally ill JW, who took hatred of "Christendom" to mean license to go around the district burning down church buildings. (This person never went to prison, only because a consulting psychiatrist classed him as "unfit to plead.")
Exchange hatred towards "Christendom" for hatred of "apostates", and it is not hard to imagine someone similarly unbalanced interpreting this as license to physically attack "apostates."
Bill.