I think a lot of individual factors affect a person's ethical behavior at work, such as knowledge, values, personal goals, morals and personality. The more information that you have about a subject, the better chance you will make an informed, ethical decision.
It takes resources when there are more animals it takes more food then when you run out of food you will have to buy more which you will run out of money its all about money without money animals will starve.
Your answer is takes resources.