It is unfortunate but some actually think they have the right to tresspass with their pets and are entitled to abuse other people's property. They don't recognize other people's boundries. Unfortunately I honestly doubt if things will change since this behaviorial problem needs serious professional
treatment as the person(s) don't understand why they must respect other people. I can pretty much guarantee that if someone showed a similar disrespect for their property, (e.g. set up a lawn chair and lit a fire on thier lawn, parked their car on the lawn, and so on.).it would only be minutes before they called the authorities. But and this is a big but they feel they
can have their animals relieve themselves on your property and in some cases destroy portions of the lawns and spread bacteria or have children roll around in the dog waste. There is no way I would ever allow our dog, and yes we have a dog. use someones else's property as a bathroom.
People should understand they are showing a total disrespect for the owner as they don't understand bad behavior. Thus the need for a professional to provide serious insight regarding their behavior.