A car accident often does not result in criminal liability. Criminal liability involves both committing a criminal act and having a criminal state of mind, which is why an accident usually doesn't incur it. Certainly driving without a  license is a criminal act, but of the most minor type; if a the prosecutor and/or judge is inclined to be lenient, there's little or no consequence.Civil liability, or the obligation to pay, is effectively worthless or valueless if the tortfeasor--the person responsible for the asset--has little or no income or assets to take; effectively the person is "judgment proof."You could try contact Immigration and letting them know that this person is an illegal immigrant who drove witout a license and caused an accident causing property damage and/or personal injury--perhaps they will move to deport him.