I've certainly had my moments when I wasn't the best parent, and there have been a few times I wish i could turn back the clock and have a do-over.
But I still think its wrong to make exagerated threats to children. Threaten them with what you will really do if they continue in that behavior, not some exagerated threat of death or dismemberment
One parently figure of mine would regularly threaten to beat me to death, or break my arm off and beat me to death with it. Now i knew he would not really do that, but it is still de-humanizing, and it made me feel like shit. Threatening to deprive me of some privilege would have had a better effect, and I would have respected him more.