Probably this means

The protagonist and Mrs. Peterson’s son (Kellerb) became the subject of the experiment and became friends. After that, he killed his son (it should be a total, and the son sacrificed to create his chance of escape. As for why: the experiment must be quite From the photos of the protagonist in the film and the black boss said to his subordinates: “I don’t want the outside world to know that this project is still going on. If the xx company is affected, we are both dead.” You can roughly know that this experiment is definitely wrong. Humane, and the guards with guns in the conference room can see the nature of their dealings with the military.), and promised Kellerb to protect his family (or guard), and "I love you" must also be good Loeb asked him to bring it to Caleb's relatives.
At the same time, the way to deal with family troubles in the film is also explained. The experiment has had a substantial impact on the protagonist, so it also pave the way for the story of killing the family of Kellerb.
As for why he killed the Kellerb family, the black boss has already explained: one of the effects of the experiment is that if he finds that his identity may be revealed, then he will kill all those who may reveal his identity, which is not even possible for him. control. Later in this post-film, when David kills Kellerb's family again, he will say that Kellerb will understand, which means that he can't control himself. In addition, when Kelleb’s younger brother killed David, David told him to the effect: "I am a killing machine. If you stop me, this is the right thing. Don’t blame yourself for this. Blah blah ......"
Looking at the whole film, it is very good, and the logic is well explained (it's just more obscure). Regarding who is right and who is wrong: The daughter is right. After all, there is a stranger at home. It is normal to investigate; because of the influence of the experiment, the protagonist has killed the friend's family, and he has no choice. The only thing that was wrong was the transaction between the military and the black heart company, and it was their transaction that caused this tragedy.
In addition, from the end point of view, if the box office is good, a sequel will be filmed to introduce the other superpowers of the protagonist.
The above are only personal inferences, please point out any mistakes. (The writing is hurried, there may be many typos)

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