The Three Fates on the Wheel of Fortune represent the natural cycles of life: birth and beginnings, expansion and growth, decline and death. This cycle appears not only in the physical realm, but in our ambitions, relationships and conceptual ideas as well. The change and impermanence of things is often labeled "good" or "bad" depending on how they benefit us, but that's like labeling gravity as evil because we fell off a ladder. These cycles are just a part of life. It's better to accept them as best we can, as Alan Watts suggests: “The only way to make sense out of change is to plunge into it, move with it, and join the dance.”
The "dissolve differences" phrase on the SJ card reminds me of a song on the PBS show Sesame Street:
One of these things is not like the others,
One of these things just doesn't belong,
Can you tell which thing is not like the others
By the time I finish my song?
Now if the point is to teach a child the difference between a lowercase "b" and "d," it can be useful. But when the concept moves into relationships with people, it can be damaging. When we focus only on differences, it drives a wedge between us. The Wheel reminds us how quickly windows of opportunity come and go. Chances to make compassionate connections won't last forever, so choose to look for commonalities now. Who knows, that one drop of compassion could grow into something beautiful.