Might as well not have cats at all then, even the laziest ones want to go outside sometimes; if they want to get out they'll wait until you leave the door open a second too long and make their move. And if you're neighbors are decent ones that communicate with you where exactly is the problem?
Frankly I don't care, human concerns always superceed those of animals and rightly so; but then again I have to deal with other people's incompetance and [censored] on a daily basis and my immediate response isn't that I want them killed because I'm not responsible for their actions. They're proper channels for dealing with animals problems, neither them involve shooting someone elses property but co-incidentally all of them are actually legal.
I must point out that at least twice I mentioned I'd exhaust other options before considering that kind of action.
But we are encountering two different scenarios in one post:
1. good neighbour, who trains their own pet to stay away from our house. (this person I want to work with -- it very very likely would never come to this, and in the case of my neighbours, they don't even have cats, and they are nice and would work with us anyways, so +++ for us)
2. bad neighbour, who disregards our property and health situations (this person I will only send smoke signals to that it needs to stop, then I will pursue legal recourse, then I will simply defend my property and wife's health), in which case, at the end of a very long road of legal maneuvers to keep animals off my property, I obviously decide to take things into my own hands since the owner cannot control their own pet and is responsible for what the pet causes.
If someone else's pets invade your property, with or without the knowledge of their respective owner(s), in the USA it is 100% legal to shoot them.
And honestly I don't blame the people that do.
I do wonder what kind of genius pet owner might live in our type of dense neighbourhood with cars driving about everywhere, as well as dogs in most yards, and other potential harmful things, why they'd bring a cat here in the first place. Sure, they technically can, but if this person likes giving their cat fresh air they certainly have no respect for what harm will likely come to it.
That one's easy: yee-haw! bang bang bang!