People might wonder how any company could have a culture which promoted unethical behavior. They might be picturing some criminal organization from a James bond movie. But a company can create an irresponsible culture in indirect ways.
At a lot of places the bottom line is everything. If the money is not coming in the business is not working. And there are only so many ways to make more money. Some of these are ethical and others are not.
If a company stresses profitability above all other things there ethics can quickly slip. If people are rewarded for ill gained successes or weakly punished for unethical behavior the culture will only get worse.