How to treat The Godfather 2' s interpretation of gangster movies?

Michael told Kay that his father's thugs threatened others with guns. Kay was surprised. Michael comforted her: This is my family, not me. It is obvious that Michael didn't want to participate in family affairs at first, which is why Kay came together with him. But then things surprised everyone. So at the end of PartI, when Kay asked Michael if he killed the head of five families, the police chief and his brother-in-law, Carlo, Michael thought for a long time. Finally, I told her that I couldn't (Arpac's eyes). Michael loved Kay deeply. After Kay left, he never loved anyone else until his death, so Michael chose to lie at this time because he was afraid that Kay would leave. Imagine if mom were here instead of Kay, and he could say: Yes, because if I don't kill them, they will kill me (Tessio and Mancini have planned it). After my death, you, our children and my family will be in danger, so I have to kill them. But in the face of Kay, he can't say that, because Kay won't understand. Next, after the shooting at home, when Michael was interrogated, Kay appeared in court. Kay didn't speak in these two scenes, but DianeKeaton used her expression and eyes to tell us how surprised and angry Kay was about all this! Kay's fifth appearance was an abortion. She told Michael that she would not have another child for him because Michael was a demon in her eyes.