A “Thomas Midgley Jr.”

Alfred Nobel might be considered a runner up, but I feel he recovered his reputation. That and I don’t think anyone but himself really was upset with the path his invention took.

I know you wanted a word, but I nominate “Midgley” to be the new word for that. “To midgley something” is to attempt to create something of value that instead only makes things worse. It’s an improvement in the negative direction.