Fox News has the heartbreaking story of an incident in which an Albuquerque emergency dispatcher hung up on a caller when the panicked caller swore at him. The caller was trying to summon help for a 17-year-old boy who had been shot in a drive-by shooting. The victim later died.
Aside from the tragedy of the story itself, this illustrates the folly of relying of the government to protect you. (This was the fire department, not the police, but the same principle applies.) Under Supreme Court precedent, the government is under no obligation to assist you, and sometimes it simply chooses not to, either through malice or (as in this case), through callous indifference.
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