I agree that Delita became absolutely ruthless...and completely untrustworthy.
I think he would have killed Ramza if Ramza had stuck around.
He was trying to appease that silly Glabados church.....that's why Oran was burned and he would have handed Ramza over to them as well.Just to mollify/appease them and keep them on his side.

Stll the presumption is that Delita put an end to the wars and rebuilt the country. An era of peace came into existance.He deserves credit for that although we hate his methods in achieving it.