Hypocrisy...

Hypocrisy is often defined in social psychology as not “practicing what you preach” “saying one thing and doing another” or publicly upholding moral norms, especially for others to follow, but personally violating them in private...cognitive consistency as a psychological terminology is a basic principle of how we function.
We seek to resolve any form of dissonance. Gawronski & Stack summarize the hypocrisy paradigm writing,
The rationale underlying the hypocrisy paradigm is to motivate people to bring their behavior in line with attitudes and beliefs to which they already subscribe. By emphasizing the rational side of dissonance reduction (“Practice what you preach”) rather than the irrational side that is often seen in dissonance-related attitude change . . . this approach provides several links to the literature on self- regulation . . . such as the possibility that people sometimes rationalize their impulsive behaviors instead of reclaiming control.