Why has the creature in Frankenstein caused the deaths of William and Justine and is he as inherently evil and blood thirsty as Victor assumed?

Baron Victor von Frankenstein is the Hammer Horror version of the fictional character Victor Frankenstein from Mary Shelley's novel Frankenstein

Unlike his novel counterpart, Frankenstein is now a baron that lives in Karlstaad, Switzerland and who is more cold-hearted. In his film debut, Frankenstein is a villain rather than hero. Frankenstein cheats on Elizabeth with his maid, Justine and is almost sociopathic in his methods of creating the Monster. Instead of using the parts of corpses, he brutally murders people for parts of his creation. But Frankenstein's reign of terror does not end there, instead he uses the Monster to kill off his obstacles, like Justine who plans to reveal her affair to Elizabeth. Towards the end of the film, Frankenstein becomes slightly more anti-heroic when he helps his friend Paul Krempe, the de facto hero of the film to kill the Monster, but Frankenstein is still punished for his crimes.

Victor Frankenstein is a fictional character and the protagonist of Mary Shelley's 1818 novel Frankenstein; or, The Modern Prometheus. He is a scientist who, after studying chemical processes and the decay of living beings, gains an insight into the creation of life and gives life to his own creature (often referred to as Frankenstein's monster, or incorrectly referred to as simply Frankenstein).

In journalism, a human interest story is a feature story that discusses a person or people in an emotional way. It presents people and their problems, concerns, or achievements in a way that brings about interest, sympathy or motivation in the reader or viewer.

Human interest stories may be "the story behind the story" about an event, organization, or otherwise faceless historical happening, such as about the life of an individual soldier during wartime, an interview with a survivor of a natural disaster, a random act of kindness or profile of someone known for a career achievement.