Molly, I know families with BC's but they do ime need a certain type, who will accommodate their need for exercise and mental stimulation. They aren't suited to everyone, I think you're wise. From what you say I guess you might be in a rural area and the number of BCs are due to an excess of farm dogs or, worse still, puppy farmed dogs which have been rescued, something which is common in certain areas, in particular rural Wales and Ireland. If so, I can see that these dogs would indeed be quite demanding.
WRT rescue, some only rehome locally BUT many, breed rescues in particular, such as, for example, GSD Rescue UK, rehome across the country. Likewise, another of many, the all breed rescue Many Tears. It's always worth asking/checking websites to see what the policy is.
The rescue I volunteer for generally only rehomes within an hours drive of it's premises. This is because of the need to homecheck and in case they need to speedily pick up a dog which the owner needs to return, as it's their (and any decent rescue's) policy to take back a dog in such cases no matter how many years down the line. However they will under certain circumstances rehome further away if they can secure a suitable homecheck and if the home is special enough for that particular dog to merit it and many rescue will make similar exceptions. You'll find the small, independent ones are normally far more flexible than the big rescues.
Hormones, for every story like the one you posted I can counter with a good one about large and/or allegedly "dangerous" breeds. We all have our own take and our own stories to relate but what I have been trying to say here is that we need to look at the bigger picture and the situation as a whole, which is that there are THOUSANDS of dogs going about their family lives with no issue to every one tragic tale. And, we need to address the problem at bare root level, encouraging good ownership, legislating against the DEEDS and not certain dogs because of their breed or because they have a muzzle and leg length of so many inches, campaigning for tighter controls on breeding, teaching people that rescue dogs are by no means all strays without history and therefore unknown quantities and that given the number of dogs in pounds and rescue across the UK people should be encouraged to rescue, not go to breeders.
(Amongst other things!).
I feel like a poker player and want to use my experience in handling and dealing with dogs to say, "I see your aggressive dog and I raise you a Pets As Therapy Doberman" each time I am given a specific bad story!
So, there was your bad story. Here's my good one
I carried this dog from place to place around the rescue when he lost all function in his back legs. It took 3 of us, 4 when we had an extra person, to do it. I sat beside him on the floor stroking his face. He weighs a ton, he was totally at my mercy, vulnerable. And all he did was lick my hands.
For every story out there that is sad and tragic, there are a thousand that are positive, but as I've already said, "Paraplegic Rottweiler doesn't bite rescuer" doesn't sell newspapers.