Since they expect the number to decrease and it has in the past, it should concern them.
Either the number of mentally ill or those mistaken or both is increasing on their 'watch', they should be considering why this is. It would indicate that they are either attracting mentally ill people or producing them and/or failing in their spiritual instruction resulting in some misunderstanding their hope.
It may also indicate that their understanding was wrong, yet that doesn't concern them. There's not much reason to have confidence in these 7 stooges.