Many a time Bible is out of touch with reality. It describes the creation of man in one sentence, yet describes the menstruation of woman in great details.
When it comes to the main theme of the Bible Paul obviously had a tunnel vision and ignored facts he could have known through even a cursory observation. Anyone can see a variety of people acting/reacting differently in same situation: Some do more righteous acts, some do more sinful acts, and others mix both the activities in varying degrees. And there are interesting contrasts too. For example, there are some very poor people who refuse to steal, yet there are very wealthy people who steal in various ways. It shows every act—whether sinful or righteous—is done out of choice! Hence there are all sorts of people from sinless to the sinful ones yet with the freedom existing for the sinless to commit sin and for the sinful to commit virtues and also with the freedom to mix both in varying degree because things change according to one’s desire which arise out of free-will. (James 1:15)