I understand the knight for he isn't like us readers who know the whole truth through reading. He is also not Ditrian who was told by his brother about Leticia and was able to find out that the rumors aren't true.
Humans are very vulnerable when it comes to the death of their love ones. Hating and wanting to kill the person who killed your beloved one is actually pretty common reaction of a human being. However, in this case the knight is being deceived by the rumors spread by the fake saintess, making his hatred directed to the wrong person.
Y'all should hate the real perpetuator (fake saintess) not the victims of the deception.





I kept on smiling the whole time while reading the confession scene that I forgot how to breathe (≧∀≦).