when you live in a world were you can read your future anytime you want, you stop questioning cretin things you do. for example, if a kingdom reads they would go to war with a another kingdom just for the sake of taking more land and they would win the war, of course they gonna start a war and genocide their way to power.
unfortunate for van, his kingdom was the one that would be conquered and he watched, as most of his family got slaughtered and his home burned to the ground just because the church (and to the lesser extant, their god) said it would happen. Van however, coming from a family devoted to their fate, accepted that as part of their world and believed it was for the best he lost everything he knew and loved.
yeah right!
Van was adopted by the church, joined their military and became the youngest commander in history of their order and decided to not only destroy the Church from within, but also destroy the scorn (the thing people use to read their future) and to accomplish this, he needs replace the human population with clones because clones dont have the ability to read their future beacuse they were never meant to exist.
people for some reason dont talk much about tales of abyss antagonist when they are the most human of them all in the series. everyone working for van has one way or the other gotten fucked over by the scorn and wish it erased.
look at this, has a full team of villains called the god generals working for him. almost an opposite mirror of the protagonists.