I think they or any other vampire are perfect to have it about. Just look at our debate here. Again though, I think we're just not going to agree on our perspective on what makes a monster. That's fair to say ya?
There are certainly truths that seem to be objective - like the sky on Earth being blue. I disagree that there are moral statements that are objectively true - the example of torture you used is subjectively true to you. To someone else, especially a being of alien intelligence, that might just be what they call Tuesday.