Actually, it doesn't matter what the homeowner thought, he went out to shoot the kid because his wife asked him to, and all married men know about that one. She knew Louisiana law regarding folks on your porch is decidedly UNFRIENDLY! We can only imagine what she did to him after he screwed it all up and caused her public embarrassment.
You are mis-representing the incidend.
The Japanese student had gone to the front door and then had gone around to a side door, scaring the wife. She screamed and yelled for her husband. he came and the student rapidily approached him, wildly waving his arms. When he did not stop he was shot and the grand jury no-billed.
It was in the paper that it was known to the students friends that he would wildly wave his arms around people.
Much more than that. He did not obey the order to "FREEZE!" and continued to charge toward than man pointing a gun at him. I remember because a big deal was made of him not understanding what "freeze" means because he was from Japan. Of couse that is not the homeowner's fault.