Like the character in her book Mary also experienced many
hardships such as being ostracized and being rejected due to her relationship
with Percy. On theme of parenting, it
was quite clear that Frankenstein should not have created the creature that
looked to him as a father. The creature
was misunderstood and was rejected by the people and he blamed Frankenstein for
that like a child abandoning her father.
They most likely wanted slaves to be afraid so they did not collect the courage to escape or disobey. With low self esteem they might not try anything.