Belonging to "Call to Action" is a "grave offense"?
Only in the mind of Fabian Bruskewitz.
A "grave offense" in Lincoln is not a "grave offense" in Chicago.
So, the grave offense in Lincoln is not a grave offense.
Call to Action is a heretical movement which opposes two ex cathedra definitions, "Humanae Vitae" and "Ordinatio Sacerdotalis". Of course belonging to them is a grave offense.
So, the grave offense in Lincoln is not a grave offense.
Your logic is flawed, but that's not a first.
"Grave offenses" are the same all over. The difference is that Bruskewitz, being a GOOD shepherd, reminds his flock that there ARE such things as grave offenses.
In this regard, it is identical to the reminder about the necessity of seeing the parish priest in cases of civil separation/divorce.
IOW, Sinky, the Church is a guide in many matters, whether you agree or not.