Valia is late to her committee on excising diabolism because the paladin wanted to talk with her but that was probably more important. She does not, after all, want to offend the Queen and all the non-evil powerful nobles in Cheliax and she doesn't want people assuming that the Church agrees with everything she says, much less that the Church agrees with a bunch of things she didn't say but kind of implied. 

None of that means they don't need to do plenty of excising diabolists.