Its is my opinion that the burden of proof on any issue that divides catholic and protestants, is always on the protestant apologists. The way I see it, Protestants were the ones who broke from Rome, so they are the ones who need to prove the catholic church wrong on the papacy, the eucharist, faith and works, marian doctines, scripture and tradition ect.
So from now on anytime a protestant says,
“prove that (insert catholic doctrine here) is true”
I might respond with. “No, you protestants broke away from us. You guys made the claim that the church was in error, The burden of proof is on you to prove that the chruch was in error on (insert catholic teaching here)!”
It would be interesting to see this used in a catholic/protestant debate. Yes I know that it probally wouldn’t work but its something to think about.