If you warn the police about someone who is dangerous and they do nothing, are the police responsible? In the eyes of right or wrong, the answer is, yes, they are responsible. In the eyes of the law, no, they are not responsible.
That’s a very interesting point because contrary to popular belief, there is no duty for police to do their job properly. There is no duty for them to provide police services in a manner that is efficient or equitable.
They must provide them in a manner that is non-discriminatory with regard to the equal protection of the laws, but the actual provision of police services on its face is not governed by law.