I once had to take a photo to persuade someone that actually it wasn't a neighbour's cat pooing in their garden, but a fox. Fox and cat poo looks and smells very similar and are often mistaken.
Those on here saying that it is the cat owner's responsibility to stop cats getting into the poster's garden - who's responsibility is it to keep foxes out? Or birds like crows who also kill and eat baby birds and small rodents? Or in some areas stoats & weasels? Or somebody's dog who has got out? Or feral cats?
And as for taking any cat found in your garden to a rescue! Chances are that the poor cat has already been rehomed by a rescue to the current owners. A rescue that is already stuffed to the gills with unwanted cats, rescued cats, strays & sometimes ferals. And you want to add to that with somebody's much loved pet who happens to have strayed over some (invisible to them) boundary.
The vast majority of cat owners do care for them. They got them because they wanted a CAT, not whatever pet seems to be cheap and easy to own. I wanted to have cats my whole life, but it wasn't until I was in my 50s that I had a lifestyle that would be suitable for cat ownership. I insure my cats as I know I wouldn't have the resources to pay out if something happened like an illness, but many people have plenty of "spare" money to spend if needed, and some put aside the cost of the premiums every month into a "cat" account to cover unexpected bills.
Some cats cost a fortune to buy, same as dogs. And some cost a nominal fee at a rescue, exactly the same as dogs.
I intentionally got rescue cats suitable as indoor only because it wouldn't be possible to catproof my garden or even build a catio (terraced slope, very little flat ground between the back of the house and the first rise).