They act virtuously out of a desire for alms. They engage in spiritual practices for fame. They are conceited and hypocritical. They secretly want people to have faith in them. Because they hope to accumulate followers, they slander and deceive sincere practitioners.
In the name of the Dharma, they engage in activities that strengthen mundane aims. This is the opposite of wisdom and compassion, like mixing food with poison. Mundane attitudes and actions are always negative and unwholesome. It is even worse to mix these concerns with the Dharma, and falsely represent them as wholesome.