Imagine a culture at work, such as politicians, police officers in large city, or accountants for millionaires, in which most people working in this

Imagine a culture at work, such as politicians, police officers in large city, or accountants for millionaires, in which most people working in this setting assume (1) other people in this context are probably corrupt or breaking the rules in some way and that (2) I'm likely to do the same, at least on some small level. What might be done to change the culture and social norms and therefore the selling-fulfilling prophecy? What actual interventions could be done within professional organizations or with in local communities of employee to stop this cycle?