In reading the account of 10 Iranian women executed in 1983, the goal was to eliminate the entire Bahai community without the world noticing it. So they basically did it little by little so no one would notice.
Well, even if you get rid of Bahai in Iran, it still flourishes worldwide, right? But I guess you needed some religious cleansing of Iran? And I guess if you had the might and power, you might just cleanse the whole earth of Bahai? Hmm.