Arabella didn't find any reason to spare Adolfo either. The latter was not even truly apologetic about what he did.
In his mind, Adolfo thought that Arabella should have at least died so that he wouldn't be the only one dying.
Adolfo even thought of making Jacob do a destructive burst of mana to try taking Arabella and Ferdinand and as many people as possible with them if they get executed.
Letting this kind of person live would only cause harm to them or other innocent people. Thus, it was better for him to be executed as soon as possible.
Jacob was the same. The only thing he regretted was not spending all the profits he gained from being Adolfo's mage. He also wanted to take Arabella and Ferdinand with them if they were going to die anyway. He hated how his stable and huge income was suddenly cut off because of one person. And that person was Arabella.
However, unlike Adolfo, Jacob had heavier reasons why he was obsessed with profits.
