I think LessWrong as a whole would find you less frustrating if you assumed most comments from established users on domain-specific concepts or facts were more likely to be correct than your own thoughts and updated accordingly.

Established users can be wrong about many things, including domain-specific concepts or facts.

A more general heuristic that I do endorse, from Cromwell:

I beseech you, in the bowels of Christ, think it possible you may be mistaken.