Any sin of an individual is never isolated to that one person because it affects other people, often in an unseen manner. One sure thing is that an individual's sin reaches far and wide into families, friends, and persons unknown to you. Much like watery rippling rings emanating from a pebble tossed into a pool of water, the outward reaching effects of the sin of one person can affect many others.
We can see this exact pattern in Romans 5:12-14 where one man sinned and it affected the whole world. "Therefore, just as sin entered the world through one man, and death through sin, and in this way death came to all people, because all sinned—To be sure, sin was in the world before the law was given, but sin is not charged against anyone's account where there is no law. Nevertheless, death reigned from the time of Adam to the time of Moses, even over those who did not sin by breaking a command, as did Adam.