The challenge with only one narrative being voiced and seen as acceptable is that there is no balance, there is no respectful intellectual debate that would test the narrative being presented. So it is one-sided and as time passes it becomes dictatorial.
This is especially of concern when the one voice is one of authority that has been seen as a trusted source.
We live increasingly in a world of homogenisation and a single narrative where the opposing one is ridiculed and presented as ‘anti’ or ‘looney’.
If we want to maintain a healthy society there needs to respectful discussion of views of all, a dialogue not a monologue.