Yes, we have all seen the damage a pet store can do to a baby bp. If only we could save them all. But most of us have at least saved oneAnd that should give us hope.
I'm sorry about the little mouse too. It can be hard, but it's really not any different than us eating a cheeseburger. They die a lot quicker than we think. Its like falling asleep i think. Most of the moving we see after could be just nerves.
The balls have to eat, and most likely if you didn't buy it as food someone else would have. You could always build a little gas chamber if the strangle bothers you. It will come in handy when your bp is eating rats. Trust me feeding live rats is noisy, and it gets a little disturbing.