Omg can you please talk about Light and Soichiro more? I'm so in love with their father-son dynamic.
I don't think Soichiro would necessarily want to kill Light like he said he would, but I think he would be deeply heart-broken. It's obvious he's proud of Light and thinks his son is so much better than Soichiro himself, so all his life his thoughts were "my boy will have a bright future ahead of him". Also, Soichiro probably knows the impact he has on Light, because I imagine it's very gratifying when your son wants to follow in your steps and pursue career in law enforcement. So, I think if Soichiro knew at some point that his son is Kira, his reaction would resemble Soichiro's reaction from DN Drama. I think his confrontation with Light is 100% canon, because Soichiro looks so hurt. I imagine, he's thinking like "Light is a brilliant boy, I made everything possible so he wouldn't feel need for anything in his life, he has a loving family and he seems to respect me so much and wants to pursue the same career as I and he's so passionate about justice — why, why would he choose to use this awful thing, why would he choose to become Kira? Is it my fault as his father? Did I do something wrong during his upbringing?" And if Light is caught I think Soichiro wouldn't pretend he rejects Light or sth, I think he would still want to understand why, and I think if there was a chance to save Light Soichiro would take it (even if it means he would never get to see Light again or sth)
I like your thoughts about it, and I think you're right in that Soichiro would be thinking a lot of things like that. I don't really remember how it was in the drama other than I remember finding Soichiro very cold and intimidating most of the time in that version of things.
I think the parts that make me think Soichiro might be harsh about it are that he also was willing to put Light through incredible scrutiny and stress during the investigation in order to prove his innocence, and to also prove that he himself was being unbiased and sticking to his own morals to the people at his work when his own family was being investigated. Light must have known that Soichiro let L put 64 hidden cameras illegally into his bedroom, for example. And that part with the fake execution was probably incredibly traumatic for them both if it's being looked at realistically. I sometimes think a lot of Light's serious behaviour in the Yotsuba arc is not only due to losing his memories, but also because he's trying to appease his father and get back into his good graces due to the fake execution being so frightening, too. Light acts almost like a carbon copy of his dad most of the time in that arc, which somewhat seems like he's trying his best to win back his father's approval or trust, just as much as it seems like he has learned almost all of his own morals and stances on things from Soichiro. I think the last thing on earth Light wanted was to fall out of his dad's favour or make his dad disappointed or angry or ashamed. And that a lot of his passion about his ideals and choice of career was because he looked up to his dad and just wanted to spend more time with him, as he was also super frustrated that his dad's work was never finished, so to speak.
Soichiro also tells Light on his deathbed that he is relieved to see with the shinigami eyes that he isn't actually an owner of the notebook after all, which means he had always had some doubt in his mind about Light's innocence the entire time. Even if Soichiro was right to always be somewhat doubtful about it, I can imagine that would still be pretty devastating to hear for Light, too.












