It's not clear cut, but the metrics chosen are important. If you care about drug use more than violence, it does seem to be clear cut. Same for the inverse.

You bear no responsibility. Everyone must take responsibility for their own actions.

I have a kid, I raise him to the best of my ability, and commit no egregious mistakes. He grows up and murders someone. Am I at fault? Obviously not, just because I'm a part of the equation, doesn't mean I also should be assigned blame. If I didn't have a kid, [person] would still be alive. That doesn't mean I'm responsible.