Police officers take domestic terrorists into custody without killing them. For example:

A white woman shot up a neighborhood while wearing body armor and was taken into custody without incident:

http://www.politicususa.com/2014/12/28/tennessee-woman-body-armor-shoots-suburban-neighborhood.html

Specific recommendations:

Mandatory sensitivity training
Minimum high school education and five years living in the communities they serve.
Nonlethal options for apprehending aggressive suspects. These options are exercised first in lieu of outright killing the suspect(s).

Literally everything else was mentioned earlier in this post.