I'm just wondering how many of the cat haters, while loathing felines, think foxes, and hedgehogs, and badgers, and squirrels, and seagulls and woodpigeons that regularly relieve themselves on people's heads, or car windscreens if you're lucky, and other wild animals that might or might not visit the garden are just fine and dandy...
We have two cats. We feed them well, they're chipped, they're neutered, they're wormed and flea-treated regularly. We have tried to keep several different cat collars on one of them, including a special bird scaring collar from America that lasted all of about 30 seconds and is now presumably in a bush somewhere. The other one LOVES her collar and jingles it at every opportunity, though we went through several with her as well. (Yes, we've tried the same one on the younger cat. Lasted maybe 4 minutes, that one.)
They are mainly indoor cats, especially with the vile weather we've had recently. We do, however, let them out during the day (one of us is almost always at home); we have a smallish shared garden at the back of the house, at the front there's a road that is used as a bit of a cut-through between the beach and town, but they don't venture to the front very much.
They have litter trays, one each, which are cleaned pretty much immediately and changed once a week (more if they're using them a lot), but when outside, they like to poo under a particular bush in our garden. They like to kill small rodents. Especially the ones which wiggled their segmented diseased little posteriors into our shed some months ago. (We know they were diseased as the older cat got VERY ill and then the younger one, who was still very wary of going out at that point, caught what she had.)
Still, one of them is getting on a bit, not sure she'll be with us all that much longer. So, just wondering, rather than rescue two new ones when they shuffle off this mortal coil, maybe we should just have them stuffed when they die, or get animatronic ones instead? A bit like in Blade Runner? No, not bleak at all.... Even better, maybe we should just settle for a VR headset and a virtual cat??
As others have said, there are ways to deter cats that do not involve trying to impale them. They don't like citrus. Ours particularly dislike citronella. They don't like water. One of the neighbourhood cats, now in his final days, was such a bully that my landlady used to have a water pistol ready to aim at him when he poked his mottled head in through the catflap. It used to work intermittently. What did work was one of our cats lying in wait for him behind the curtain one night and then jumping his bullying backside.
Those spikes look vile (and I grew up in a part of the country where people used to put glass and barbed wire on the back walls to deter burglars). Aye, those were the days.
Sure they'd be brilliant at deterring the homeless too, though, if planted in empty shop doorways, eh.
OP, I am glad the spikes are down and I hope your kitty heals and gets their confidence back soon.