Why is it that ruthless is the basic skill of businessmen?

Because he only has money in his eyes, it is good to make money. He will smile like a father to every customer, which is only related to professional body language and has nothing to do with the brilliance of human nature. If he is enthusiastic about employees, he will not deviate from the most essential purpose of his work, because people who do business want their business to become more and more prosperous.