Just showing people there is a choice, where they previously thought there was none...

.. can be the most important thing we can impart to other people...

and sometimes all that is possible, 

when discussing certain topics with people who hold a different mindset to our own.

People can't be convinced of what they don't want to believe, 

unless they have some leeway in their belief and are willing to change.

Only they are in control of this process, not us.