So it make this part actualy funny, as you ignore the specifics to try and juge other.
Try typing back a reply when you're not shaking in anger at being called out. Not that I was calling you out specifically. Can't take your fantasy reasoning being criticized?
I mean, that's what it is. You're basically operating on, as I pointed out, fictional logic where characters have a simple and sweeping reaction to good and bad. With no concern for their own feelings, their relationships, the politics, the customs or the culture.
Person did bad, let's count up their "sins" anime power level style and execute him! Come on. Anis has clearly given her side of the story, and it's also clear to all why he did what he did. Nobody was actually killed either, and in the worst case, Anis the now future Queen will not let him die for something she knows he actually did for her. He's also cooperating to root out the real traitors.
The guy is being punished and sent away. Royals being banished for attempted regicide was a common practice in the Holy Roman Empire and it's affiliates/contemporaries, it's not the same as a noble or commoner attempting it. Banishment is an ACTUAL PUNISHMENT, which you seem to just not be able to accept. He's lost his status, his freedom, his future. He'll be under house arrest indefinitely. HES EFFECTIVELY IMPRISONED FOR LIFE. Even if his life will probably be somewhat more comfortable than a common criminal.
But I wonder if you have an ounce of empathy to be able to see that. Al's mother's reaction for example, perfectly shows us (not tells) the dynamics at play here. That his family knows why he did it. I should also point out it doesn't mean they forgave him, just that they understand. The rest is just the fact that he's their (the king and queen) son.
Stop living in fantasy. You say fiction is rooted in the real world, but it's you whose applying only fictional and unrealistic logic to your viewpoint.
Speaking more generally, I can't help but also point out the irony of pushing for the kind of lack of empathy and royal intimidation that made Al so unpopular as their royal heir in the first place. While the opposite is why Anis is the favored candidate, and touted to be the key to reforming the noble class and magic ministry. It's not just the specifics of the story, it's like you lot are reading this entire series on autopilot.