There it is the “intruder’s” fault for putting himself in a situation he knew was dangerous. Did he not think it dangerous he would not have been crouching in the corner.
Sure, he bears some responsibility, but the daughter bears more responsibility for inviting him and not telling her father.
As for the crouching, we don’t know why he was crouching there, since he’s dead and can’t tell his side of the story. For all we know, he may not have known who the father was and just saw a strange man with a gun who he was hiding from.