It depends on what exactly the 'story' is. If it's a fictional horror story that uses the concept in a non - promoting - of - real - harm way, it might be less unethical but still not a great choice as it can be disturbing. But if it's depicting real - life torture, it's highly unethical to watch as it desensitizes people to the horror of torture.
No. If it involves real torture or inhumane content, it is completely unethical to watch. Such content promotes violence and cruelty.