An opinion not a resolution to this growing problem.
Not justified. Neither were posing a threat to the home owner. Understand the home owners wanting to stop the theft but was the contents in the packages really worth shooting? My preference would be to try my best to be able to identify them & call the police.
According to the video one was shot in the foot. While excessive IMO that should have been the end of shooting. The one shot in the foot not likely to run away. Why shoot the other one?