[Spoiler discussion] in Reinhard's defence.
So everyone is hating on him for following the kingdom's orders and trying to capture the Emilia camp.
But there are two key points to him that make the situation understandable.
First, Rom, with him and Felt both prisoners and hostages he cannot simply disobey the orders, and that’s something that plagued him from when he was little, the kingdom keeps him in check only because of his humanity, and all of the attachments he hold.
Second, it seems to me that in little ways, he's doing his best to help the Emilia camp, he evacuated to limit casualties, but really had he not ordered it, other people could have followed them, and thus they wouldn't have escaped.
He is fulfilling the role of the sword saint as worse as he can, he is too much of a tool to be a hero, and too much of a human to be a tool.