I think it was a technical blunder and I don't buy into the idea that they're responsible for the actions of individuals in a riot.
If someone upset that they (or more likely someone else) should have won a prize takes actions that lead to the death of another ... I don't believe Pepsi is responsible for that.
It still seems like a very interesting part of history whether they were at fault or not. They have made dumb mistakes on multiple occasions if you remember the Harrier Jet give away they blundered and someone came up with the points. So I believe this is worthy of mention on the Pepsi Wikipedia page it’s part of the business success and hardships. Maybe there will be more. Maybe not.
So then let people come to that conclusion on their own after they've read the facts. The Wikipedia content shouldn't imply fault. It just needs to document what actually happened.
If someone upset that they (or more likely someone else) should have won a prize takes actions that lead to the death of another ... I don't believe Pepsi is responsible for that.