How to explain the self-punishment in fortune telling?

Chenchen (Dragon), Wu Wu (Horse), You You (Chicken) and Hai Hai (Pig) committed suicide. Self-punishment means that people with pigs will have a hard time with themselves. For example, people in the sea (pig) will hurt themselves if they meet the sea (pig) again. As far as marriage is concerned, these four groups of people belonging to the same genus are not suitable to be together, otherwise they will "fight against each other" and "kill each other".