I agree that in this case, the BOs were incredibly and criminally negligent.
have only once put a padlock on a stall. It was only because I was in the process of selling the horse, and the buyer had not paid for the horse yet. I was told by one of the trainers in the barn that this buyer brought their trailer and was planning to take the new horse home after dark. I said, nope. Put a lock on the stall door and left. The buyers left me a very nasty note, citing fire danger (we’re in the very wet PNW, no fire danger at this barn at this time at all), among other things and how awful I was to do it, etc. Oddly, they came up with the outstanding balance and took the horse home the next day.
That’s the ONLY time I have ever done it and I would certainly think more than twice about doing it again. But how these people could conceivably justify doing it on multiple (30??!!) stalls is just mind boggling. Not to mention just up and leaving and screw the horses if they burn up. And their puppy? They should never be allowed to have/care for animals ever again!