You'd do good if you try to stop any man to protect his child because it's according to your best conscience about what is good in such a situation. No one would blame you. Yes, Abraham's case was special and extreme. If someone tries to do it, it will be in 99,99% wrong thing and horrible deed. It's always difficult to judge without knowing a complete pictutre. You can be right in 99,99% cases but it doesn't mean that you're always right.