Not sure whether this is merely an allegation or there is indeed concrete proof.    I'm sure there must be many CEO's who get caught up in a scandalous situation.   Many do not get caught, but some do, and ultimately lose their jobs.    When in such a high profile role, one with power, CEO's should understand that they are in the public eye and need to be seen as a role model.  I think sometimes it is more about the use of power, arrogance and abuse of trust that throws into question the person’s outlook and judgment moving forward.   They know the rules, and in this case I think Darren wrote the staff handbook!   Is the scandal the reason for his resignation -  people might question?  Yes of course it is.   The performance of the business under Darren has been strong, and the company is very well-positioned to continue executing on its strategy for growth.