Why was the Byzantine text type written?

How could the writers of the Byzantine text type add to the text of the Bible with a pure heart? I understand there are almost no New Testament Byzantine texts before the year 300 A.D. The earliest Bible texts we have are the Alexandrian text type, each more minimalistic than the Byzantine. Why did the writers of Byzantine (or rather the Editors) add text even though it wasn't inspired, unlike the original text? Wouldn't God have Protected the original text?