“Man lives not on bread alone, but on every word from the mouth of God”. It tends to be that when a non-Catholic (or which also applies to a lot of poorly catechised cradle Catholics like me) see genuine, strong Catholicism, they acquire a hunger so to speak, that only grows stronger. It really is a longing for spiritual food.
For that reason, protestants (or any non-Catholic group under the sun) try to prevent any of their congregation from being in a state of mind to even desire to come within a mile of Catholicism. That’s why we have the most misunderstood faith in the world by a long shot, despite having every aspect of it authoritatively defined, written down and available so easily (penny Catechism!) not to mention 2000 years of history without a single contradiction. We are in the age of information yet the vast majority are misinformed. A powerful proof of the devils bias.