As a corollary to increasing identity leading to increasing credibility, it is worth noting that criminal tendencies increase as anonymity does. Anonymity, because it inherently removes a person's association with his actions, allows conduct without consequence, and therefore non-accountability; likewise, when fully identified, a person can be tracked down and punished for his behavior.
If a member of a community is not accountable for his own actions, he can commit crime without consequence. It makes sense, then, that crime is more likely when punishment is not a risk. In the case of pseudonymity, even if punishment of the person is impossible, the reputation of the pseudonym within the community will suffer, as other members will know to avoid him.