Doctor Who is powered by all types of love–friendship, romance, familial, altruistic, colleagues, self, etc. etc.
It’s believing in and performing kindness and compassion and courage in the face of hardship and fear and hatred. Kindness is not weakness, but rather a type of ferocity. Kindness is not naivety, but rather a deliberate choice.
It’s believing and acting that we’re all bigger on the inside than we even know, or, at least, that we’re capable of being bigger on the inside than people would expect.