Pages get scrubbed but not before someone in a police department somewhere gives a name tip to some reporter who then uses the profile puc in news stories and credits facebook.
The police actively contact social media and tell them to pull all pages related to these types of murderers. The authorities want to control the narrative. The only truth that exists is what they tell you. They don’t want the public getting ahold of any facts that don’t’ line up with what they want to tell you.