I mean, the product you worked on was part of the causal chain of this, but that's something entirely different than responsibility. You might be considered responsible if you could have known that this would happen, yet pushed on nonetheless. In this case, however, I cannot imagine you could even suspect something like this would happen.

Of course, with the power of hindsight, you wish you hadn't worked on it. But you didn't have that power when you were working on it.

Anyway, not sure if this helps - I know it's easy to feel guilty for things like this. I'm not a psychologist, and everybody confirming you weren't responsible probably isn't enough to convince you of that. If you do feel guilt, however, seeing a psychologist might be a good idea.