The basic rule of self defense for officers is:
The amount of force that an officer may use, is in direct
proportion to the amount of force that they believe is about to be
used against them
To use overwhelming force to defeat the resistance used against
them
The amount of force that an officer may use is in direct proportion
to the amount of force they know is about to be used against
them
The rule is dependent on each department's individual policy
toward use of force