because people are either scared for their jobs,
or it works for those who are so valuable, its "OK".
This means when they say something that is WRONG, everyone
else in the room does a quick knowing meeting of the eyes
with everyone else, and decides to let it pass.
It's always fun explaining to the new guy, who is about
to interrupt and correct the speaker, that it's just better
to shut up. Not that it's dangerous, just unproductive.