Business ethics includes human qualities of, and it does not provide the angelic qualities. Therefore, if a businessman is overwhelmed, there is a possibility that ethical rules will be twisted. It is known as "ethical lapse," which is a short-term and quite rare occurrence.
Ethics at an individual level may seem to involve only the individual but it is a holistic process. There may be high pressure from co-workers, managers, or any other constituent of business culture to be unethical. Individuals may hate such pressures, and tend to work avoiding the dilemmas.