From some experience working with state and local law enforcement:
Many, if not most, of the cops who become Narcs are the cowboy or hotrod types. They like to break down doors and scare people. They like to play with the toys the special units get. Small town swat-type units have a tendency to get over excited.
Sounds like these boys got a tip from someone who saw the 5 finger leaves, drove by with binocs, saw it for themselves, called Barney, Earl, and Bubba, and went Rambo.
>>Small town swat-type units have a tendency to get over excited.<<
Do not profile! Big city swat team units have the same problem.