Didn't like season1 finale. Spoilers.

Cuz your GAY. Makes sence Hahahahaahaha

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If you call that severe breakdown and almost shooting TT (would have if Elise had not physically blocked him) "hardly any grief from dad", then what exactly did you expect?
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Spoilers continued.

That's the story - although Karl is supposed to be so devastated that he can't go on and spends a year convalescing and his marriage ruined.

You have to see the original version which is Danish and Swedish (Bron/Broen) to really get an idea of both Elise (Sonia) and Karl (Martin).They are both underdeveloped in this rendition. Also, the finding of Adam was a real puzzle and major. In the original version Sonia figures it out while Martin has just lost all rationale. She gets so close. She also saves Martin from killing TT and keeps TT alive because TT really wanted to die knowing that he permanently destroyed Martin. Martin doesn't recover from the loss of his son and spends time in psychiatric counseling trying to get past it all. He is not in the police department at the start of season 2 but is on some kind of hiatus. His wife is also not so willing to be with him. So, Martin is a broken man. Meanwhile TT is incarcerated. The second season is fantastic as well - Swedish/Danish one - as Martin and TT face off again. But it is Sonia who is the genius at all levels - she might be rude and insenstive but she is beyond brilliant. Something that doesn't surface in this series with Elise. Not the actress's fault, it is just not in the writing.