Every time they open you up you run a statistical risk of coming out worse off than when you went in.
Medical people need to be much more honest about this.
Yep
That's certainly true. In the case of organ recipients, however, the situation is already not good. The alternative is basically to die. I think I'd play the odds and take the surgery under those circumstances.
Now for elective things, nope. Never getting cut unless it's really really necessary.