Byzcat, to most people Eastern Catholics are just Latin Catholics with funny vestments. To try to explain legitimate differences in law and theology usually ends with them calling the eastern catholic either a heretic or orthodox so this is the usual progression
This comment leads me to believe that you are now going on the offensive because you do not have the proof for what you are suggesting in this thread. No one here is calling Eastern Catholics schismatic.
So again, provide proof that the Catholic Church (Eastern or otherwise) allowed Catholics to attend schismatic sacraments/liturgies for reasons other than in danger of death.