You would think as an emperor he would be smarter
But I guess that a hole trying to kill him didn't knock some sense back to him
I think it's more complicated than that. He doesn't have a lot of children left. Who's he going to have as Keen when he is gone? We don't know if the emperor knows that the guy with the brunette hair is his illegitimate grandson? For All We know, The Grandfather's trying to protect him but doesn't want to burn him by forcing him to be an emperor in place of his other grandson that he knows was conniving against him, but who does he have left? Otherwise, maybe the emperor is planning something but he doesn't want to tell his grandson. For all we know, he's already ready to choose the brunette grandson to be emperor and make the white haired grandson the second Crown Prince. As I said, we don't know what's on his head but it is a complicated matter because he doesn't have much children left to pick from. This is why I like a democracy better you can vote for somebody else to be ruler of your kingdom
Stupid excuse to let your murderer go. Also, he really thinks such a son can rule the impure to prosperity? I bet you the first thing he do when he gets the throne is try to kill or hinder the ml..