One aspect of an occupation is that we receive payment for our work. It is reasonable to enjoy a sense of satisfaction when we are paid. But problems can arise when we are offered payment to perform our job and it is not in the best interest of our customer or society at large.
An example of this situation might be when a bartender is asked to sell a drink to a customer who is obviously drunk. Another example is the banker (or credit card company) who extends credit to someone who is clearly not a good risk.
Laws in many states hold bartenders legally responsible for damages done to a third party because of drunken behavior of their customer. As of today, there are not similar laws protecting individuals or society from the poor judgement of lenders. I suspect there are other similar situations you can find that deserve attention, as well.
It may be difficult to say, “No, thank you,” to a customer and their money, but sometimes that is the kinder and more appropriate thing to do. In fact, in many states, even if you are simply hosting a party, giving a drink to someone who is drunk may be against the law.