I am not certain what the point of the toxoplasmosis reference was. Cats, most definitely can become carriers of toxoplasmosis, whether they are indoor or outdoor, because if they had a mother who was not indoor her entire life then that would transfer to her babies. Therefore, there is a strong warning to all preganant women to be tested if they own indoor cats especially, because they would have a greater risk of coming in contact with cat feces via changing the litter box. It is vital and important to wash your hands after cleaning the litter box. Chicken feces can also be very dangerous and full of nasties that can affect people. That is why when cleaning the coop, wearing a mask is suggested, and again washing your hands.
Please understand that I agree that another persons pet pooping in your garden or yard is a big no no. Let's face it poop is dirty and full of undesirable things, which is why it is expelled from the bodies of all living beings (waste). Many people on this site live any many different areas and follow different state to state laws. What the law may be in one area, may be completely different somewhere else. I am in an area full of horse and cattle farms, and I hate black flies, which come and multiply in the poop of the horses and cattle, and flies can carry disease. But, this is where I chose to live. Again everyone has a right to their own feelings and opinions, and if they live in a neighborhood with fences and home owners associations they may have greater laws to district free roaming pet cats as well as they should because they chose to live there.
It seems that some people live in rural areas where there are barns and large farms where cats are an integral part of that farm life. Some live in suburban or even urban areas where the neighbors cat can become a big problem. That can also become true about people's feelings on their neighbors owning chickens. Many places won't allow roosters. What if there was a law that did not allow anyone to own a rooster, would everyone think that was acceptable? I doubt it. If you own a cat and live in a neighborhood that is urban, suburban, then yes it is much safer to keep your cat indoors. But, if you live in a rural farm area where it would take the cat awhile to leave your property, which by the way they don't wander if they are spayed/nuetered, then I don't think someone should be able to tell you that you have to keep your cat indoors only.