In a perfect world? Sure. In the real world? Ahahaha!

Law Enforcement (in the USA at least) has no requirement to act to prevent or interfere in an actively occurring crime. Their role, strictly speaking, is cleaning up the mess after a crime has happened. They investigate, and, ideally, capture those responsible, after the fact.

A cop has no legal requirement to help you if you are actively being attacked. Let that sink in for a minute.

This is one reason that many law-abiding citizens make the (rational) choice to conceal-carry a firearm for personal protection.

But you won't hear about that from the mass media because it's not the agenda they want to push.

It depends who you define 'us' as. It has been empirically proven that that United States is not a democracy[0]. 'Us' is now corporate interests and for profit prisons. To further illustrate take a look at some of the talk about Donald Trump (and Bernie Sanders as well) for example, now let it be clear I don't support the man but one of the major criticisms is that he is a populist. You hear it time and time again on CNN, FOX News, etc. How is that a criticism in a democracy? Shouldn't all politicians be populists? At least ones that want to be elected anyway.

[0]http://www.bbc.com/news/blogs-echochambers-27074746