Your warning on the cowardly  building of walls instead of courageously risking searches is an excellent one. But doesn't the Church discourage the risky searches you note and demand its members to hunker down behind canon-protected fortresses--even going to the extent of calling fellow searchers heretics, apostates, or even sinners? "Let's search together, but I know I'm already right and it's a blasphemous sin to say you might be" won't cut it. 

Nothing can chill a quest "toward" truth faster than arrogance and pride at the starting line.

The great scientific researchers tell us that true discovery comes only after admitting "what we've claimed to know isn't sufficient, but, hey, that's great, since we now know where we've been wrong, often very wrong. March on. With rigor and vigor."

Too, building walls around "truths"--which you so correctly warn against-- prevents one major, proven, joyful, and underrated characteristic of  search and discovery---serendipity.