Yes, I agree with Big Uncle.
It is important for us as Dorje Shugden practitioners, to know about the history and how Dorje Shudgen came into being, and how the ban came into force. Without being armed with the right information about our own Protector, how do we even begin to explain to others.
So, we must be the first to understand the story of our Protector - only then we can relate the story to others, with clarity and conviction.
In this way, we will be the kind of Dorje Shugden Ambassadors who work to benefit others.
In truth, we can only truly uphold the "good image" or perception of our Protector through our own actions and speech. If we behave in an unpleasant manner, then it will seal the "unpleasant" impression that others hold of our Protector and HIS practice. Hence, making the misunderstanding even worse.