Other states call Choice or Evils the Doctrine of Necessity.  Essentially the person is forced to choice between two alternatives and the violation of a minor law or minor infraction must be allowed to prevent a major violation of the law or more serious harm. 

One example is that in order to save a life a person may have to break into a medical supply store.  The crime of taking property or trespassing had to be committed to avoid the loss of a life.  However this is a difficult defense unless it can be proven and it can never be used if the harm committed is equal to the harm avoided. Therefore it can never be used for an intentional homicide while Justifiable homicide is a defense to intentional homicide.

Just because the law grants you the right to use justifiable homicide does not mean that you won't be prosecuted or sued anyway.  It is your burden of proof if you carry concealed outside your home or auto and you must know the law if you are in licensed for concealed carry in Kentucky.   Essentially here is the Choice of Evils Statute KRS 503.030 which is similar law to the legal defense of Justifiable Homicide KRS 503.050.  Notice that Choice of Evils which is also called the Doctrine of necessity can only be used if the use of force was not lethal.  If you are prosecuted or sued the Justifiable Homicide defense will even protect a person from civil liability under 503.085.