[Alana Flames]

Cats know where they live- they always go home.
Cats don't dig up gardens or make a lot of noise so I don't see what the problem is.
I had a cat growing up that would wander all over but always came home, and she really enjoyed being outdoors and exploring. She lived longer and healthier for being able to be outside and get exercise. She also took care of the neighbor's mouse problem.

As for the swimming pools- I'm not sure what you're worried about. Cats don't like water so they wouldn't go in- and if they fell (unlikely) they can swim.

And as for trapping- when i was really little I had another cat which my neighbor caught and killed. Pretty much the most horrible thing to happen to a 4 year old.

Where I live now there are probably two or three cats at least at any given time in my yard- they aren't mine, but they aren't hurting anything so I don't mind at all. You don't have to worry about them getting hurt or lost- cats are more resourceful than you might think.