Drivers will drive away from the auto accident scene without stopping or contacting the authorities for multiple different reasons:
Under the influence: If someone is operating a vehicle under the influence of drugs or alcohol at the time of the accident, the repercussions can be very serious. The fines can be tremendous and they can be arrested and face time in jail.
Driving with a suspended license: It is illegal to drive without a license or even with a suspended one. If someone is caught,it is a serious criminal offense. Someone driving with a suspended license will drive away from the scene because they do not want to get charged or caught not having a proper license with them at the time of the auto accident
Lack of insurance: It is also illegal to be driving a motor vehicle without the proper insurance. A driver without proper insurance is likely to leave the scene. If they are caught, they will face civil liability and criminal charges against them that come with driving without insurance.
Not wanting to get a ticket: It is quite common that if a driver has multiple driving tickets within a designated period of time, the courts could decide to suspend their license. If the person driving that caused the auto accident already has multiple tickets to their name, they probably want to avoid getting another ticket which would cause more problems for them. It is also possible that someone will just drive off because they are nervous and do not want to interact with the police and get a ticket altogether.
Overall fear: Auto accidents are not easy to deal with and a scary thing to experience. There is a lot of uncertainty. People can be afraid of their spouse, employer, kids, and parents finding out. Even if the auto accident was just a simple one with no injuries, it is still not an easy situation to be in. It is common for the driver’s mind to go blank and the first thing that comes to mind is to drive away as fast as possible. Just keep in mind,  It is normal to be afraid after being in an auto accident.
It does not matter the reason for someone to leave the scene of an accident and create a hit and run. At the end of the day, leaving the scene is a serious criminal charge. The driver who left the scene can be charged with large penalties for convictions.