Thanks Doug for your response and for the link to the video .
We agree that conscious instructor intervention is required to set up the environmental parameters (safety) and expectations (openness) that learners will adapt themselves to -- the co-creation of a social environment that invites and supports learners in sharing their ideas freely and without fear (1:44 in the video).
My initial response to your post was based on the assumption that you were teaching in Canada to a cohort of learners from multiple ('non-Canadian') cultures -- however after checking out your profile I see that you are actually teaching in Japan to a cohort (I am assuming) of primarily Japanese learners.
For me this changes the dynamic -- as the dominant culture in your case is Japanese (which to me means it is you who will tend to adapt to the environment around you) -- and you seem to be attempting to create a (not-necessarily Japanese?) bubble of safety/openness within that dominant culture. Complex challenge -- you seem to be swimming against the stream. Not sure why, but something in me intuits that if you succeed in this the transformative potential for your learners could be amazing.