User blog comment:Gcheung28/Submit Questions for Grimm at SDCC/@comment-8203434-20130719000907/@comment-1509826-20130719105553

I always assumed it was because his victims simply wouldn't remember, after all other wesen have tried the same trick when they plan to kill the person who see's them.

Alternatively Baron Samedi simply doesn't care, and as he's got royal backing the Council is to afraid to intefear.