Violent children

 "You can't change people without destroying who they were." - The Butterly Effect

Few days ago I watched "The Butterfly Effect" and I wondered how they make children act in such violent scenes without causing irreversible negative effect on their mental health.
 "The Butterfly Effect" (2004) is an American drama/thriller film. Starring Ashton Kutcher and Amy Smart. Evan Treborn (Ashton Kutcher) finds the way of traveling back in the past thus altering future. All in attempts to save Kayleigh Miller (Amy Smart) the love of his life. Film has got dark and gloomy scenes when young actors have to deliver very mature and offensive lines. For example, when Evan goes back in time when Keyleigh violated his daughter for the first time. Example taken from its script:

--------------------------

Evan's face is flushed with rage. He walks behind Kayleigh and cups his hands tightly around her ears. She can't hear anything now. 

                 EVAN

         What time is it?

                MR. MILLER

         It's time for you to stand where

         the hell I told you.

               EVAN

         Wrong answer, fuckbag. This is the very moment of your

         reckoning. In the next thirty seconds you're going to open

         one of two doors. The first door will forever traumatize

         your own flesh and blood. 

The mature speech seems completely surreal coming from a seven-year old. Mr. Miller looks around the room as if he's the butt of some sick joke. 

.........

            EVAN

         Listen close then, fuckbag. You screw up again

         and I swear I'll flat out castrate you. 

------------------------------

It's only one 1 scene as an example. There are lots more in the film. An actor playing 7 year old Evan was only 11 years old. So I'm wondering how they make young actors say those things without traumatising them. From what I've learn during Researching module I can say they a vast team of psychologist and researchers working with children and their parents to assure there won't be any impact caused. Team of professionals make children to be aware it is only a play but on the other hand make them believe it is true and real so a film could turn out good.

I do not think I'd allow my child to play one of roles on "The Butterfly Effect" unless they are old enough to realise what's going on.

10/10