I do not see how Mr. Parish was in danger or had to respond with deadly force in this situation. Having said that, I do not have any issue with a person protecting his property or life with deadly force if required. But in this case, I do not see that.
You raise some interesting points. Some of them depend on local law in Mississippi. Here is the relevant Mississippi code:
§ 99-3-7. When arrests may be made without warrant
(1) An officer or private person may arrest any person without warrant, for an indictable offense committed, or a breach of the peace threatened or attempted in his presence; or when a person has committed a felony, though not in his presence; or when a felony has been committed, and he has reasonable ground to suspect and believe the person proposed to be arrested to have committed it; or on a charge, made upon reasonable cause, of the commission of a felony by the party proposed to be arrested. And in all cases of arrests without warrant, the person making such arrest must inform the accused of the object and cause of the arrest, except when he is in the actual commission of the offense, or is arrested on pursuit.
http://www.lexisnexis.com/hottopics/mscode/
In general, citizens have the power to stop felonies and make citizens’ arrests.
Mr. Parish went to considerable lengths to avoid shooting the person who was attempting felony damage. He then retreated to avoid having to shoot the person who attacked him.
Once attacked, and struggling to maintain control of his firearm, he was justified in using deadly force to defend himself.
We can second guess his decision to stop a felony in progress, but he appears to be justified under the law.
Thanks
The law allows a citizen to intervene in a felon. It does not allow citizens to use deadly force to accomplish that goal. Should a citizen do so, as in this case, the use of deadly force may not be covered by this specific chapter of the law.