I thought about it and right now I'm concluding that at least one meaning is in reference to Martin Luther King. King's "disease" was his fight against racism and injustice for his people. Why would a noble cause be a disease? Because it is ultimately what caused his death, which is what a disease does. It also causes pain, frustration,, and tests you,, but if you survive it, it makes you stronger.This is compounded by the fact that King initially took a nonviolent approach, but later saw that maybe arming one's self wasn't a bad idea and integrating with racists was premature.