The movie shows the lead characters take the law in their own hands . Not correct . I liked the film but gave three stars out of five in my review ( it's in my review thread ) and not more because of this .
And they are doomed for it...

WARNING: spoilers below

Francis wants revenge and while she's never going to get it against the person who killed her daughter she's going to get it against some other rapist.

For Rockwell's character he's going to martyr himself at the end of the story. Instead of blowing his brains out he's going out to get revenge on this one guy.

Neither character is going to live happily ever after, it's ends on a happy note because you are dealing with contentment.