I don't think it's implying the grandchild is in danger. The danger simply is that getting behind the wheel of the toy will make him want to start killing again, but the grandchild doesn't fit his profile, so he has no reason to go after him. The men he killed were all early 20sI'd hope it's just a bait and switch and he doesn't hurt the grandkid, but the fact that at family parties and even his daughter's wedding the only thing he is thinking of is his murders doesn't bode well...
Arguing that a kids environment has no impact on what kind of person they grow up to become is so insanely silly you shouldnt even be acknowledgedThe old man deserves no sympathy. There is not a dark urge that can be inherited from your parents, it's you and only you