if you can’t trust the people
then how you trust that your father is actually your father
it all depends upon trust
we believe in Quran because we trust Hazoor PBUH
similarly we have trust that these people have done best effort to separate unreferenced ahadees from referenced one
and you know if you say something even correct but Hazoor PBUH didn’t told, you will be the great sinner, so you have to take care of reference , as much as possible and for thoes we have to trust muslims