Be Kind
Finding perfect agreement on almost anything is rare. Sometimes, even often perhaps, we end up learning our beliefs or positions on a given topic are truly irreconcilable. The 'Be Kind' component is a reminder for how to treat each other when those divisions become clear.
Another way to put this could be to 'extend grace'. Outside of family or lifelong friendships, it is exceptionally difficult to know exactly what the person on the other side of a position or opinion has gone through leading them to the perspective they now hold. It is highly counter-productive to assume differences or disagreements are driven by evil or ill-motives.
In short, this world is full of heartache and hard choices - we all have bad days and tough things going on behind the masks we wear in public; that too is part of our shared humanity. In a sense 'Be Kind' is the balance to the 'Have Courage' component as we 'Seek Truth' together!