I think SteveS indicated they'd do their best. I believe they will.
You'd be naive, then. At least in some parts of the country.
I grew up in "the Region," NW Indiana: Gary, Hammond, East Chicago, Whiting. Cops wouldn't always come to your rescue. For example, if there was a call on Michigan Avenue in East Chicago, the police would stage themselves on either end of the street, then wait fifteen minutes before coming in. That was for their safety. They'd basically wait until the natives were done, then come in and clean up the mess.
I don't want anyone to get the wrong impression. By natives I mean the people native to the area. In this case natives would most likely be Hispanics/Mexicans. But there could also be blacks with a smattering of Polish and hillbillies.
I used to put myself in some dangerous situations 30-35 years ago. I wouldn't do that again without at least two pistols on me, but back then it was what I was used to.
Chicago was worse. When I rode around with my friend who lived there he would point out a lot of things I didn't notice. Thing is, in Chicago it is hidden. Even if it is reported it is hidden, Or ignored.
The Calumet Region is really pretty fascinating.