From The Truth About Guns:

Consider, for example, someone who’s from a wealthy, safe neighborhood. They know very little about what it’s like to live in a high-crime area. They have probably never been robbed or threatened with violence from a total stranger. And if they do face threats, they have no qualms with calling the (armed) police who are usually responsive and happy to help.

Now compare that to the experience of someone from a rougher part of town. First, the cops there are probably not as responsive. What’s more, police can often become antagonistic, poking their nose where it doesn’t belong (see below) and sometimes arresting the very people they arrived to help.