Right but the point is you at least need to notfiy them first and give them the chance to do something. If you're unsatified with what they've done, or lack thereof, then sure.
The point isn't a point at all, since their sister had already notified the police and given them a chance to do something. Read the article: "My sister had already had a couple of police visits about the previous incidents."
Copy written lyrics so they can't be stolen
If they are, Snap! Don't need the police
To try to save them, your voice will cease
So please, stay off my back
Or I will attack, and you don't want that