I have a grandson who has twice been arrested for drunken driving. He doesn't believe that he is an alcoholic. While you and I might agree that two DWI convictions is proof of alcohol abuse, your grandson will probably not alter his behavior until he accepts and deals with his disease of alcoholism. In most states, drivers convicted of DWIs have to undergo alcohol counseling. You can certainly express your opinion, but only your grandson can accept the responsibility for alcoholism and seek the help that he desperately needs.
Alcoholism is characterized by denial.
When the alcoholic accepts that he is powerless over alcohol, the healing process can begin and sobriety will become the most important thing in his life.