A 400 pound hog will meet its demise if shows up on my property. I doubt it was the first time it escaped its owners custody. I would give the owners a chance to recover the remains and make compensation for any damages.
The Hmong knew that the pig was someone’s pet. This would be like me shooting the neighbor’s dog because it crossed into my yard. And besides, even the life of a pig (or even a rat) is more valuable than the life of a Hmong...