Dennis Hopper was obviously a talented actor but he was part of a culture that saw drugs and alcohol as a way to solve problems. After the 1967 counter-culture film, Easy Rider, he spent the next 10 years in a spiral of addiction. The Hollywood community dismissed him as a burned-out one-hit wonder. They were correct. Although he is reported as appearing in 115 films he never repeated that one film success. There are those that would disagree with this assessment.
Just look at his behavior after winning moderate acclaim for his part in Apocalypse Now in 1979 and then directing a movie, Out of the Blue. He again returned to alcohol and drug use.
He is not the first actor or singer to fall into this trap. He should be remembered but not honored.