Lol - LEO don’t get that much more training.
Am pretty sure Alameda Sheriff’s Dept. and most agencies in the SF bay area these days issue “patrol rifles” to nearly all squad cars, not limited to SWAT or special teams/units.
For those that scoff at a 20 hr class. In Alameda county you can get certified as an instructor in 40 hrs! 
https://www.sheriffacademy.com/class.php?id=44
@Daedalus You are thinking wrong. There are many cases where shooters when confronted by someone armed with a firearm, simply give up or are readily subdued when they otherwise may not have been.
But the best synopsis is this FBI report, which I am surprised (or not) that I haven’t run across before which looks like it was prepared by the FBI with Texas State University.
Resolutions
The majority of the 160 incidents (90 [56.3%]) ended on the shooter’s initiative—
sometimes when the shooter committed suicide or stopped shooting, and other times when
the shooter fled the scene.
There were at least 25 incidents where the shooter fled the scene before police arrived. In 4
additional incidents, at least 5 shooters fled the scene and were still at large at the time the
study results were released.
In other incidents, it was a combination of actions by citizens and/or law enforcement that
ended the shootings. In at least 65 (40.6%) of the 160 incidents, citizen engagement or the
shooter committing suicide ended the shooting at the scene before law enforcement arrived.
Of those:
■ In 37 incidents (23.1%), the shooter committed suicide at the scene before police
arrived.
■ In 21 incidents (13.1%), the situation ended after unarmed citizens safely and successfully
restrained the shooter. In 2 of those incidents,24 3 off-duty law enforcement
officers were present and assisted.
■ Of note, 11 of the incidents involved unarmed principals, teachers, other school
staff and students who confronted shooters to end the threat (9 of those shooters
were students).
■ In 5 incidents (3.1%), the shooting ended after armed individuals who were not law
enforcement personnel exchanged gunfire with the shooters. In these incidents, 3 shooters
were killed, 1 was wounded, and 1 committed suicide.
■ The individuals involved in these shootings included a citizen with a valid firearms
permit and armed security guards at a church, an airline counter, a federally
managed museum, and a school board meeting.25
■ In 2 incidents (1.3%), 2 armed, off-duty police officers engaged the shooters, resulting
in the death of the shooters. In 1 of those incidents, the off-duty officer assisted a
responding officer to end the threat.26
Even when law enforcement arrived quickly, many times the shooter still chose to end his
life. In 17 (10.6%) of the 160 incidents, the shooter committed suicide at the scene after law
enforcement arrived but before officers could act.
In 45 (28.1%) of the 160 incidents, law enforcement and the shooter exchanged gunfire. Of
those 45 incidents, the shooter was killed at the scene in 21, killed at another location in 4,
wounded in 9, committed suicide in 9, and surrendered in 2.
