When I attended my JC meeting, I was thinking to myself, "If they could, they would take me outside, tie me to a tree, and light me on fire." They're really scary. As it stands, they have their great Hit Man in the Sky, but he keeps delaying. I know that, in the past, they have expressed regret at not being able to stone wayward children and wayward others to death.
Lucky for us, it's against the law. But, Caesar's law does not take precedence over "Jehovah's law."
This is all speculation. But watch your back. Fortunately, no JW's here know anything about me.
Frankly, I don't think it's likely, but individual JW's have lost it and killed.