Well, according to catholic sources, they are the only two instances of the pope speaking ex-cathedra. you're refusal to acknowledge that leads me to question anything else you say.
I completely understand the fabricated, non-biblical position to which catholics have elevated Mary. I have read the catechism of the catholic church and the position regarding mary is idolatry plain and simple.
You might check difference between veneration and worship before proceeding with your fraudulent claims.
You do make quite the case AGAINST individuals making their own interpretations of the Bible.
The notion that the Bible interprets the Bible and therefore leads to inerrant understanding is quite laughable, as you have so clearly illustrated.