Inappropriate short stories can mislead the values of readers, especially young ones. If they are exposed to stories full of immoral or unethical content, they may start to think that such behavior is acceptable. Also, in a social context, it can create a negative cultural influence as it spreads ideas that are not in line with the general good.
They can have a negative impact on the mental health of readers. For example, stories with excessive violence or disturbing themes may cause anxiety or nightmares.