Another possible reason is Minato's own experiences. Maybe he has faced a lot of losses in his life and doesn't want Naruto to go through the same. He knows how cruel the world can be to a ninja, especially one with Naruto's special status, so he becomes overprotective to prevent Naruto from facing similar tragedies.
One reason could be guilt. Since Minato wasn't there for Naruto when he was growing up in the original story, in the fanfiction, he might be overcompensating for that lost time. He feels like he has to make up for all those years he wasn't around to protect his son.
Love is also a big factor. Minato loves Naruto deeply and doesn't want to see him get hurt. He has seen the harshness of the ninja world and wants to shield Naruto from all the pain and danger that comes with it. He may think that as Naruto's father, it's his duty to keep Naruto safe at all costs.
Chapter 224 is the strongest chapter-level answer because it starts from Jiang Li, ranked number one, was directly taken by the staff to an elegant... and follows through on After all, the fans of Su Yinwan next door had already thrown down nearly....
Look to Chapter 237 for the clearest answer. It begins with It seemed as if, believing the spilled water couldn't be recollected, Ah..., keeps building through Why did I do this?" "Senior, have you forgotten your own glory?" "I..., and lands on The netizens responded in chorus, and no one insisted.
Look to Chapter 221 for the clearest answer. It begins with Many agricultural students found themselves with tears brimming in their..., keeps building through Great, the hardships of agricultural students have finally been discovered., and lands on As a result, the production crew of Shanbian.
Chapter 263 is the strongest chapter-level answer because it starts from Southwest Wildlife Protection Association V: On the evening of July 10 of... and follows through on But when she saw Wen Jiaojiao and Qi Tianyu and others standing up to....
If you want the clearest chapter reference, go to Chapter 197. Early on, Seeing that no one cared about what she said, Su Yinwan immediately felt...; later, the chapter leans on Then she wanted to attract everyone's attention back, looking directly at....
Chapter 209 is the strongest chapter-level answer because it starts from He Yun suddenly spilled out over a dozen cards. and follows through on While he, after a whole bunch of them poured out, ended up with only nine.... The payoff is that the chapter closes with Damn, who is this guy?
Look to Chapter 198 for the clearest answer. It begins with He wrapped his arms around himself and stepped back half a step, eyeing..., keeps building through Is that not okay?" Jiang Yan: "....." "Just be normal, please., and lands on How is that possible?" "Because I've calculated it, there are.
The best chapter pointer here is Chapter 201, "Passing the Door Three Times without Entering". It opens with The third time she passed by happened to be when she was rushing back... and closes on Indeed, I'm not well-received." "Ahhhh, these two are going to sweetly....
Chapter 204 is the strongest chapter-level answer because it starts from Su Yinwan didn't move, but Director Qian turned around, ran to the... and follows through on Jiang Li immediately met their gaze, her icy and indifferent look....
Chapter 199 is the strongest chapter-level answer because it starts from Damn, the production team is actually being so generous this time, giving... and follows through on You knew all along?" Zhao Lang adopted a contemplative look before curving....