Okay. It is your right to disagree, but my right to maintain my opinion. I think people have a right to protect themselves and their children. In this case, I believe that is what she was doing.
Normally I would agree with you, but the sequence of actions doesn't seem to support that, or at least not from the start.
The woman knew her husband had child porn. From Danny's description, it is not known for how long she knew. Also, his interest in nazis was more than likely something that was not kept a secret from her. Most people would rather you know they are nazis than into children. In any case, she should have known. Also, the guy had been abusing her. For how long, we don't know. Still, it probably wasn't something new. Chances are the guy had been abusive, maybe not sexually, to his daughter. The woman, knowing all this, decided to kill herself. Maybe she thought it was the only way she could get away from her husband. Maybe she thought if she was dead, her husband couldn't hurt her. Whatever her reasons, she did not take her daughter's, or anyone else's, welfare into consideration.
Yes, she changed her mind and decided to not kill herself, but instead kill the guy. so...
I do not see this as vigilantism, I see it as taking steps to stop someone who posed a very real danger to the daughter. She wasn't trying to administer justice herself, she was trying to keep her daughter safe.
I don't think it was vigilantism, nor do I think it was her trying to protect her daughter. That may be what she said, but that isn't what her behavior before the killing indicates to me. It's quite possible that she killed him to get back at him for all the years of abuse. That he had child porn and could have started to, if he hadn't already, abuse his own daughter seems like a convenient excuse for the murder.
And I think her actions are understandable and not deserving of time in jail. It was correct for her to be tried, but I think sending her to jail would not have been the best outcome here. Had she gone to the police, there was still the possibility he would have molested the daughter (either before the police had a chance to do anything, or if the police could find no reason to arrest him). This action entirely eliminated that possibility. The way I see it, she took that action knowing she might do time, because she thought it protected her daughter more than the alternatives. I do not want to send her to jail for that.
Her actions are understandable, but even understandable actions can be illegal.