Comment by thrance

Not entertaining the Basilisk, but it's basically the idea behind MAD: for nuclear deterrence to be effective, you need your enemies to believe you will retaliate in case they strike first. If you don't actually retaliate when they do strike, then they were right to believe you wouldn't, and the strike could probably have been avoided if you did retaliate, so they would have believed you would.

It's a twisted kind of logic, and I think I'm getting mixed up in my tenses. But you get the gist. For the Basilisk to be effective, it has to actually do the torturing, for its threat to be credible.