Everyone I know who has had cats and let them outdoors has lost one or more to traffic. Cars & trains mostly.
Let's face it, most of us don't live on a remote island where it's 100% safe to let their cats outside.
Is it better to let a cat outside and have it die prematurely, or let it live a safe, pampered life inside? With a lot of attention and love why shouldn't an indoor cat be happy?
Or you could buy a kitty leash and take her for walkies

Something I'd probably do if I had a cat as I have absolutely no concern for my self-image

My family did say they'd disown me, however...
Personally I feel it is better to let a cat live the life it wants to live. If that means it faces more dangers but is happy and living life to the max, then I will deal with the heartache if something bad happens. My two cats are brothers, and like chalk and cheese. One loves to be out and will be out all day, the other loves to sleep! He sleeps indoors a lot, and never really goes far when he goes outside - Usually to the garden to 'his spot' where he sleeps a bit more!

But, crucially, he has the freedom to do so.
I will not keep my cats indoors because of my own fears, it is not fair on them. If I do not live in a suitable area, I don't have cats because keeping an outdoor animal indoors is, in my opinion, cruel. Cats are predators, and designed to have a territory and hunt it. Even domestic cats have this innate nature.
Secondly, there is not a cat alive who will not be happy to go outdoors if the door is left open. The people saying their cats are happy indoors are those who have purposely kept them indoors from kittens. But I bet if the doors are left open, their cats would go out and explore. Sure, it would be tentative at first because they will be nervous - all cats are when exploring a new place and it can take weeks for them to go further than the back garden. But it is part of their development process and as they get more confident they start to explore a little further.
Regarding cats and foxes, I have never known of a cat being troubled by a fox. There is plenty of anecdotal evidence of foxes attacking cats, but the science and research simply does not support it. Generally they will leave each other alone, or the cat will be the aggressor and see the fox off it's territory. That is not to say a fox could not or has not killed a cat, but the general concensus seems to be a fox will not risk an altercation with a predator like a cat unless it is absolutely necessary or the fox is desperate for food. Being a wild hunter as opposed to a well loved domesticated one, a fox wants easy prey and will not want to expend more energy in hunting it than it will likely get from eating it and it will certainly not want to risk life threatening injuries in the process (IE blindness from scratches, infection from bite wounds etc).
The trouble is with a lot of the anecdotal evidence is plain:
Person sees a fox in the area one night.
Persons cat gets injured/goes missing/killed.
Person puts 2 and 2 together and gets 9.
Fox gets the blame.
In reality, it could be a whole host of other reasons but the fox gets the blame. I remember the Telegraph publishing an artile years ago about urban foxes killing pet cats. The entire thing was anecdotal, and even the supposed eye witness story was totally out of keeping for the behaviour of foxes. She supposedly witnessed a 'pack' of foxes attacking her cat. Foxes don't hunt in packs, they are solitary animals. The only actual expert they used in their article totally refuted the entire content of the article!
There are very few incidents corroborated with evidence of foxes attacking cats. So I am happy to let my cats come and go as they please. I am more concerned about the penis who lives further down the street who uses the estate like a race track!
We don't keep our children indoors all of their life because of what bad things may happen to them, do we? I have the same outlook with cats.
Regarding indoor cats never knowing the outdoors and not missing it, this is fallacy in my opinion. They have never known it by force, that force is primarly the fear of their owner. If all of the indoor cat owners on here are so confident their cats have no interest in going out, how about you leave your doors open every day for a week and see what happens?
For those who have a pedigree breed and then keep them indoors, I feel this to be a bit selfish. Again it is all about the owner. Owner wants a particualr breed - why? Because
they like it. Said owner petrified of losing that investment from theft or premature death because it has cost
them a lot of money. Owner keeps cat(s) indoors to protect
their investment based on
their fears. Sorry, but it all seems selfish to me somehow.
To conclude, I think it is to each their own on what approach they take to pet ownership and I am sure indoor cats are well loved. But personally I do not feel they have full lives.
On a separate note, I don't like the idea of catteries because my one cat is very sensitive (bless him). Being away from home is distressing for him. The other cat, mid you, loves a bit of adventure! We use a guy we have used before from a place called Animals at Home (
http://www.animalsathome.co.uk/ ). It is a franchise, I believe, but we have had great service. Basically he comes twice a day, to feed and water them + give them any medication they need. In the evening he draws our curtains and turns a couple of lights on and in the morning he does the reverse. He empties / cleans the litter tray and he even puts out the bins for us too. When we come home he makes sure there is fresh milk in the fridge and a full report on what he has done and observed with our cats for the time we have been away.
I think last time we had him for two weeks and it cost somethng like £145. I am not sure what catteries charge to be honest, but we were more than happy to pay it.