I don't think picking up the poo is about keeping the peace, it's about common decency. Seriously, if I wanted dog poo in my yard I would stop picking it up every day in my back yard where my dogs do their business.
I guess a lot of it probably comes from people not knowing their neighbors, so they don't care about them by extension. We really don't have an issue with that here, everyone I see walking their dog has always been super respectful.