Time for the pot and kettle graphic......
Catholics as a whole are singularly incapable of considering an alternate point of view.
If it conflicts with their cherished beliefs or if *sacred tradition* states otherwise, a person can't convince them even from Scripture. And then there's the complication of the church calling down anathemas for those who disagree with them on a great many points.
I suppose that answers the question, though, of why they refuse to consider something outside Catholicism. Why put your eternal destiny at risk by daring to cross the church which claims power to retain or remit sin.
That's quite a bit of power to hold over someone's head to compel obedience.
The discussion tried to make a sudden change in direction here.