I disagree, and I don't think hyperbole furthers the discussion. I've been helped by police in many cities (in America and elsewhere) on several occasions. I've also witnessed harassment, abuse of power, and indifference- fortunately less so than the former.
The above commenter stated "The police are never there to help you". as in, that it is not their purpose. Although I have no doubt you have encountered some police that went above and beyond their job description to help you, this does not change the fact that helping you is not their job, or purpose.
Many police cars used to have "To protect and serve" painted on their sides. I certainly remember that, although I haven't seen it in years.
No one is saying they expect the police to carry your groceries inside. They are law enforcement officers whose job description is to enforce laws. If they can't/wont' do that because of external factors, then citizens should be told the truth about why that is. Vigilantism comes from a sense of injustice, that the system doesn't work for unknown reasons. Without that transparency, we are left to fill that void in understanding with our imaginations.
If you're saying that law enforcement will never render aid, thats prima facie incorrect.