If you speak to a cat owner you'd find out how to discourage them, a bit of pepper is all that is needed.

Not really practical that is?,they crap all over the lawn and in the borders plus soon as it rains its usefulness has worn off.

As pointed out earlier, cats aren't stupid, we have a few around here but they aren't seen in our garden.

I've never deliverately let the dog (big dog) out when there's a cat in the garden but there have been occasions when he thinks he's seen one and gets all in a huff when he can't find it five seconds later - maybe thats put them off but its also probably because the whole garden will stink of dogs now to a cat - and they aren't stupid.

As I said before I love cats so am probably biased, but I would say dog poo is a far bigger problem than cat poo, can't say I ever remember standing in cat poo on the public pathways. But as for killing wildlife I'm sure cats do have an effect on the bird population. Maybe a cat license would be a good idea? Cats should also have to be neutered and spayed unless you are a registered breeder IMO. Or keep em indoors, my two are perfectly healthy and happy and don't go out so cause no bother.

It's not public paths there using though is it , It's peoples gardens . Look up Toxoplasmosis if you don't think cat sh!7 isn't dangerous .

So, we should kill everything that poohs, should we, Foxes, Badgers, Hedgehogs, lets just do away with every single living creature....?

it's not practical, it's just nonsesne.

You mean foxes, badgers and hedgehogs are all using my garden as a toilet?
I wasn't aware of this ... something needs to be done.

Lets face it cats are easy to look after and thats why there numbers have doubled in resent years.Lazy owners just let them out at night and let then back in, in the morning.They put a bowl of water and food out for them then away to work they go.They come home from work,give the cat a stroke,then throw it out again to begin it murdering,crapping spree again.
Iv'e no idea why cats even exist anymore.

for many months when we first moved in here we blamed next doors dog for leaving "presents" on the lawn, I eventually got so fed up I ripped the lawn up and decked it and put fencing all around, at roughly the same time I bought a Go Pro camera and was messing about with time lapse shots of insects, so I left it on all day, when I got home and looked at the footage I saw a Fox using our garden as a toilet, so I had to go to the neighbour and apologise, it seemed it wasn't their dog (or solely their dog) at all.

Animals defacate, and they really don't respect boundaries.

Erm, most animal faeces is dangerous, not just cats, look up Toxocariasis 'if you don't think dog sh!7 isn't dangerous' (I've quoted your strange use of a double negative for effect)