You are retard anon-san, let me explain then.
1. Kicking his son out of a castle is a way to protect him from the fight for the throne among family members. Lelouch and Nunnally were weak back then, do you think would they stand a chance against the other sister who like killing or the sadist eldest sister or Schinizel?
2. Charles indeed thinks that war are for foolish people. He himself no longer waged war, most of the power play are from the power play of his sons/daughter. Does emperor actually care who wage war on who? No, he has a bigger concern: the unite the world to defeat the god. "Deprived China out of their everything", doesn't mean go to war against them, its his son/daughter interpretation.
3. Of course the emperor loves his kids. But he knows full better whats better for them. He knows about the world of C, to him dying and going there is just like going to shopping. Euphie going there for him isn't a big deal, its probably better for her anyway.