Some time ago, our neighbor’s adult children would throw wild parties, attended by scores if not hundreds of people that were noisy, inconsiderate and littered the street with food and drink containers.
When we called the police, they would sometimes respond, but the problem persisted. To make a long story short, we contacted an arbitration service who conducted a meeting between us and the neighbor; after we met and exchanged grievances, the neighbor agreed to stop after I enumerated a long list of incidents and threatened a lawsuit. Basically, we had to do it ourselves.
None of the events above were life-threatening, although some of the young adults made threats against us. We decided to acquire even more home protection than we already had.
The police’s ability to intervene on the behalf of the law-abiding will get worse before it gets better.
Here’s another case of having to do it yourself as told by Mike Adams to a reporter at The Athens (Ohio) News (excerpt):

An old, trite expression, “Sly as a Fox” was put to the test by a group of scientists and students in the Pacific Northwest several years ago. They baited and set humane traps in a forested area known to be a Kitt Fox habitat. When a fox was trapped, it was tagged and released. 