No one thought the main character (Robert) was a bad guy?
It's funny, at the end of the movie, you don't find yourself hating Robert. You feel bad for him.
It seems like in every situation, we forgive him. Pulled a gun on his wife....yeah but he walked in on her screwing another police officer. Killed Ingerlise, yeah but her life was crap anyway, better to be dead than getting beat all the time and hating your life everyday, and besides it was an accident. Killed Jorgen, yeah, but he shouldn't have been raising Dorthe, he was a violent bully, an abuser, etc.
Killing Ingerlise was probably the most disturbing one. Though, I found the scene not convincing at all. He barely held the pillow over her face for 20 seconds. Not enough time to suffocate, and have you ever tried suffocating yourself with a pillow? Usually you can still breathe anyway.