If I were him and witnessed the same truth like he did (my wife's murderer reappearing as well as stealing her watch and another lecherous geezer laying his hands on my daughter), I would have been a murderer as well. And hence, Dan-sensei was sympathetic with him for his overprotective feelings toward a daughter is universal. However, it is quite sad that the daughter never knew her dad.
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If I were him and witnessed the same truth like he did (my wife's murderer reappearing as well as stealing her watch and another lecherous geezer laying his hands on my daughter), I would have been a murderer as well. And hence, Dan-sensei was sympathetic with him for his overprotective feelings toward a daughter is universal. However, it is quite sad that the daughter never knew her dad.