If harm is serious and cause damage so it is considered as crime.
Explanation:
The nature of crime is the act that is done is considered wrong by the society, the act of that person causes harm to the society or the harm is serious so it is considered as crime. If the crime is not big so low punishment is given to the criminal such as fine or jail for few months, while on the other hand, if the crime is serious and it cause great damage so big punishment is given to the criminal such as death or jail for a long time.
