Why is foreshadowing important in 'Antigone'?

Foreshadowing is important in the play 'Antigone'. In terms of the readers and viewers, it's a preparation for the dark turns that the play may take. In terms of the characters, it's a warning of disaster ahead if they take the advice or read the signs correctly. For example, the sisters Antigone and Ismene talk about the consequences of obeying or disobeying a recent law that changes the fabric of Theban society by denying god-given rights to disloyal Theban dead. Ismene cautions against disrespect for the current law. She refers to the ignominious deaths of their parents for breaking the law unknowingly. She fears even more miserable deaths if she and Antigone are knowing lawbreakers. Antigone breaks the law, is sentenced to a nightmarish death, and chooses the same death as her mother had: suicide by hanging.