[Catholicguy]

. They are infallible only when they declare doctrine dogmatically

Another error. ALL Ecumenical Councils are infallible by their nature

[ultima ratio]

All ecumenical counsels ARE NOT infallible by their nature. This is because the Holy Spirit only protects from error that which is intended to be declared as doctrine--and Vatican II specifically stated it did not wish anything it said to be taken dogmatically. Its purpose was pastoral. Otherwise we might ask why its insistence that Gregorian chant be retained was given such short shrift by liturgists. Tell me, what are the Vatican II dogmas you think we are bound to assent to?