My heart breaks, watching the video, w/911 recorded conversation.
One of my "puppy-buyer" "associates" owns a pool cleaning business over in coastal, lower,California. He is younger than the age of shooter (from what I gather of the recordings). That's one of the points I come from, no _detailed_ knowledge of the biz, certainly not this one.
Now, in the aftermath, I think the homeowner is likely to spend a great deal on lawyers, might be ruined. The courts/jury must assume that in a sane world, he is to be of normally functional discernment (within the growing bounds of what is mutually agreed upon as "sanity").
My take?
Some "sketchy" pool service company, trying to make ends meet with entry-level ground troops, failed to contact customers and inform them that to make up for "behind schedule" service, they were working their pool-cleaning techs into "after-hours".
And the older gentleman homeowner, unapprised of this attempt to restore schedules undertook ZERO investigation before sending lead down range. And once he started pulling the trigger, he couldn't help himself, commitment being commitment.
Self-defense proponents KNOW this will become a landmark.
Aberration?
No matter.
News and sound bytes are calibrated for those with the attention span and critical thinking skills of a gnat.