Cultural– and subsequently legal– parameters define responsibility for the sake of structure, but philosophically speaking I think the following argument can be made

The Person who makes decision X that leads to failure Y or success Z, makes said decision because of all the influences impressed upon him from birth, from society and environment, that lead him to believe that decision X is the "best" decision from all given options at the time. Person decided X on their own, but every experience and interaction with every single thing ever encountered in Person's life is responsible collectively, because Person is a direct result of the combined impacts of all influences and interactions thereof.

Legally, realistically, and especially socially, this argument cannot stand to reason because people expect direct, singular punishment on a single "responsible" person, based on their previously-defined liabilities. Saying "I didn't take ethanol, seeing my mom take ethanol when I was 8 made me do it" doesn't fly in court when you've hurt someone at age 20.

Classic debate though, I'm curious who else throws something out there/argues this.