Coincidence is not a form of irony. Sarcasm obviously is, Dramatic is when the reader/viewer knows more than the character in the plot. Situational irony is when the opposite of what's expected happens, and Coincidence is not an irony.
Answer:
This question is vague.
Explanation:
While turning on people is considered rude and almost childish, there are many reasons as to why people do it. Many times a lack of trust in one another. Leaving the relationship destroyed and a lack of empathy is missing.
Or taking another approach, scientifically, a person can turn on another the same way an animal would. If a survival instinct were to kick in, any togetherness would be left behind and your mental state would turn selfish. Putting yourself first over helping others.
