So when it came to auditioning for Harry Potter and the Chamber of Secrets, he had a different sort of role in mind.
So when the characters they played in Harry Potter both had their allegiances called into question, it was easy to assume they were evil, making the revelations about their characters far more surprising.
And Gary Oldman has played numerous murderers, corrupt officials, terrorists, and vampires throughout his career.
His character committed numerous atrocities far beyond the scope of war, including the murder of wounded soldiers, women, and children.