The best of us (the worst of us)
When we join an organization and become part of something, collisions happen. Standards change.
Sometimes, these tribal affiliations push us to become better versions of ourselves. We take a long-term view, check our selfish impulses and work hard to meet the high standards of those around us.
But if we're not careful, we can join a group that indulges in our selfishness, one that pushes us to be callous or short-sighted. To become part of the mob, or the insolent bystanders.
There's nothing inherent in the way humans associate that will lead to one or the other. But once on the path, the culture is difficult to change...
The challenge, then, is to push ourselves to find the right groups (and leave the others behind.)