Many of our social, political, economic, and personal problems seem to stem from a strange tendency in human nature to yearn for a kind of purity. What that purity is, depends on the embodied cognitive framework of the person; it could be anything from a kind of adherence to a political ideology to an abhorrence for a conceptual category (a class of things, behaviors, ideas which the person has decided is anathema to them, and must be avoided). Any hint or taint of this has to be eliminated from their lives.
To some extent this can be an idealistic impulse that opens up possibilities -- demanding purity isn't always bad. It can force things open. But, all too often, it leads to a closing off of possibilities as well, missed opportunities, or an inability for people of good will to work together. The demand for purity creates an insuperable barrier, sometimes, to people with even mildly different frameworks to come together.
We can ameliorate this to some degree by forming architectures in which people with disparate perceptual/conceptual frameworks can nonetheless work together without having to iron out these differences. However, it would also be wonderful if we could somehow wean ourselves from this primal desire for purity in the first place. Many terrible things have come from that impulse, even if it isn't always destructive.