besidemyselfwithfury I don't recall ever saying I thought it was cruel! I think it is unrealistic though, jumping over fences isn't the only way cats get in and out of gardens, they can climb up trees, 1st floor extensions and trellis. A weird fence thing isn't going to stop them if they want to get out, not a chance in hell. I have even seen them climbing up rose bushes with all those thorns and up onto the top of an open back door to get up where they want to be!
I stand by what I said that if someone hates animals so much to the point where they say they will poison them/kick the shit out of them (as has been said on this thread) then they are not a nice person and so not someone who I would care about. I usually find that people who dislike animals are very cold, unemotional, unempathetic people, just my observation. I tend not to like people without empathy.
As for toxoplasmosis, are you aware that it is also carried by birds and other animals? It's not just cats by any means. Are you going to try to keep birds out of your garden as well? You are also much more likely to catch it from eating raw, undercooked or cured meat than from a cat. (That is a fact)
There is also something called Toxicara which also causes blindness and can affect internal organs. That is spread by dogs, cats and foxes, so I guess you have better find a fence that will keep foxes out (good luck with that).