I have a feeling that there is likely to be considerable outrage at the OP.
I would like to make a couple of points before this happens.
There is a valid view that these are your animals and your responsibility and should remain on your property.
It would seem reasonable in this case to extend this to all and any animals ‘owned’ by someone.
So, for cat lovers for example one would expect the same considerations to apply. Cats in this respect are quite difficult to keep on a defined plot of ground; they also crap in your garden, yowl and whine outside at night and dig up your carefully arranged flower beds. Of course, the solution is to keep cats in a cat run.
As one might expect, suggest to a cat owner that they keep their cats in a cage and run you’ll get looked at like you’ve lost your mind and told that keeping a cat like that is the very essence of cruelty.
Strange how this doesn’t apply to chickens.
A similar problem arises with dogs. Many people do at least try to keep their dogs contained in their yards in suburban areas. However, what often happens is when these dogs get walked in the ‘countryside’ the owners let their dogs off the lead and the dogs run around enjoying their freedom. The problem is, it’s usually on someone else property. It’s common here to get dogs appear, with the owners oblivious to their dogs behavior.
Tell the dog walkers here that if you see their dog off the lead on the property you’ll shoot it and they’ll consider you a completely unreasonable and horrid person.
I would much rather have my neighbors chickens in my ‘yard’ than I would their cats, or dogs. If I’m lucky they may even lay a few eggs there, they’re unlikely to kill or harass any of the other wildlife apart from bugs and they do in general go to sleep at night rather than bark or yowl outside my window.
So, I won’t be joining the outraged. What I will say given they are ‘your’ chickens and ‘everybody should deal with their chickens in what ever way they please’ as I often read on these forums, then if your neighbors don’t mind the chickens in their yards and you don’t mind the possibility that they may well get predated then I can’t see a problem.