Do you remember in M once the child is killed? She was playing with a ball and then he buys her a balloon. Now, we see just a bush and then the ball rolls out and comes to a standstill. Immediately we know that the girl is dead and then we see the balloon flying away. This is action, in a certain way. It is not violence.

At the time when I did M, I had to show one thing—how a murderer rapes a child, right? Let us say he slits her up. Fine. Aside from the fact that it is very horrible to look at, and very tactless, it is only one way to show it and many people would look away. But if you don't show it—if you just let the audience know what happened—then every single man and woman can imagine the most horrible things, correct? And then they help me. I don't show any violence and I don't have to show them the horrible thing of how a child has been raped.

...I always thought that I never showed violence, which is wrong. Have you seen the fight in Cloak and Dagger? This fight is violent. I was very proud. Gary Cooper, who usually never made a fight—his double made the fights—he made this fight. I am, let me call myself, a liberal, which is not very correct, but let me call me that; and I hate fascists, and this was the fight of a decent man against a fascist. So, seemingly, my hatred got the better hand of me.

Fritz Lang
from an interview with Lloyd Chesley and Michael Gould, 1972