There is a certain corporate guilt to original sin. This is not a personal culpability, since we did not commit the particular sins of Adam and Eve. But in a sense, in the Garden of Eden, human nature was being tested. Adam and Eve were sinless before the Fall. We are not sinless. So we each would have fared no better than Adam or Eve. Thus, we deserve, in a sense, to inherit original sin. It is a guilt that is imputed to the human race (except Mary and Jesus) because our sinless representatives, Adam and Eve failed, and we would have done no better.
However, original sin is not a deliberate sin, and so it does not deserve eternal punishment. Only deliberate sin, specifically unrepentant actual mortal sin, is punished in Hell.
Pope Pius XI, in the encyclical Quanto Conficiamur Moerore, n. 7, wrote:
“Because God knows, searches and clearly understands the minds, hearts, thoughts, and nature of all, his supreme kindness and clemency do not permit anyone at all who is not guilty of deliberate sin to suffer eternal punishments.”