You have to admire leaders in their zeal and desire for the truth. The difficulty lies in their insistence that anyone else who does not quite understand the creedal formulae or has not yet moved to a completely orthodox position is automatically bound for hell by council decree. Too often the ploy was to exert political pressure on rulers, be they emperor, city bishops, or local civil officials. Yet, through all the posturing, tortures, and executions, the word of God was preached and doctrine firmly established to the orthodox teachings we have today.
I will build my church, and the gates of hell shall not prevail against it. (Matthew 16:18)There is no other explanation.