I don't know maybe the fact that a lynch mob exists in the first place, and the whole blashemy thing been the root cause, maybe people need a bit more critical thinking and less brainwashing from religion.
Ok so it happened in Pakistan, a majority muslin population, where the punishment for blasphemy ranges from a fine to the death penalty. The religion of peace thinks it's ok to kill someone for saying something bad about some guy, who may or may not have existed as long time ago. Just think about that for more than a minute and tell me that's not crazy.
The police officer would probably have been part of the mob if they weren't an officer, being an officer wasn't the issue, being brainwashed by religion was.