This isn't complicated.

The hateful and unjust lie of the polygraph test is useful. It allows you to persecute on false pretenses.

They do not want a lie detector. They want a magic button to push to allow them to detain anytime they want. Fail a polygraph? Go to jail. Pass a polygraph? You used terrorist methods to do so.

Friendly reminder that American soldiers in Abu Grahib used rape as a weapon of tourtue.

But don't worry Google isn't developing ai weapons that would be trouble.