Even when I'm sure my dogs are willing and obedient I put them on a leash around livestock for the livestock owner's peace of mind. Dogs aren't robots, even 'good' dogs may change their minds. I'm a big fan of dog-killing livestock, as well as farm surveillance. Getting cheaper and cheaper to keep your vulnerable farm areas under recorded watch. Dunno if you would do that in a rather public area, i.e. a farm so close to the neighbours that they can tell you what happened, but if you had signs up saying you were recording your animals, I doubt people'd take such chancy liberties.
What's with the lack of livestock guards, I wonder? Someone on this forum told me why they couldn't have donkeys, and didn't want to spend pasture on alpacas, but surely there's more options than that. Are Maremmas banned where you live? There must be better long term solutions than sitting on your porch with a gun or just waiting for the next dog attack, and the next...
Best wishes with your situation. Sounds like there's a need for some kind of innovation here.