Why was Venom so bad?

Could you elaborate on why you believe Venom, the fictional character and antihero from Marvel Comics, was portrayed as a "bad" character? Was it due to his violent tendencies, his tendency to prioritize his own desires over others, or was it perhaps a result of his complex moral code and ambiguous morality? It's interesting to consider the various factors that contribute to a character's depiction as "good" or "bad," and how these perceptions can shift depending on the context and the audience's perspective.