To be fair, I don't think people wanting cats kept in doors/garden cages are wanting this out of concern for the welfare of the cat...
As I said, it really is a live and let live situation. I'm not a big dog lover, but I appreciate other people love them and have them as a companion/gives them joy so I tolerate the nuisances they bring to my life because I accept not everything in the world around me is about me/my likes and wants.
When you let your cat out, there's going to be certain dangers, but that's part of life, and you assess the risks accordingly. For instance, I wouldn't buy/rent a property by a busy main road if I was going to have a cat because the risk is too high. I live in a fairly quiet semi rural area, so the risk is reduced, and I'm happy to let the cat roam. I'd also always make sure my cat was neutered. My cat has had ticks before, but considering I got a tick on myself from when I was laying in my own garden, the risk is there right on my doorstep, so a cat could pick up a tick whether it's trapped in it's own garden or roaming a field.
You don't have to be vegan to worry about birds, but unfortunately, nature kills nature across all animals and birds, and the biggest threat to nature is humans. So it is a bit hypocritical to preach so loudly about the welfare of birds, then no doubt tuck into a chicken dinner later on. During covid, when humans were locked up, there was a big shift in nature, and I'm sure all the lovely wildlife breathed a sigh of relief!
Cats are not the issue here.