[Havoc]

I'd imagine something along the lines of "knowing about a crime being committed without reporting it".

[malka]

I'm not sure the cops would like it, if each person who ever visited SR out of curiosity gave them a phone call.

[extempore]

The purpose of criminalizing such activity is not to discourage people from engaging in it. It is to guarantee that everyone is a criminal, thereby ensuring that leverage is always available.