[publius911]

Some of these calls are because people (black people) broke a rule or were doing something obnoxious.

Or stupid.
Like crossing a street in the middle of a block, towing a toddler and daring drivers not to slam on their brakes...

This gets specially exciting in certain cities that have a huge number of stolen cars, which daily have accidents, kill themselves (no loss) or an innocent other driver or pedestrian.

U.S. Stolen Cars

[yesthatjallen]

Or challenging or provoking.

There are multiple reasons besides 'racism' and each one has to be examined on their own merits.