Wikipedia seldom disappoints on this kind of thing: https://en.wikipedia.org/wiki/List_of_inventors_killed_by_th...

Thomas has three different inventions with a massive body count. The last one had a fatality rate of 100%.

I mean, even at the start 13 - 15 people were killed in leaded gas's infancy all because the oil companies couldn't make as much money from ethanol as from tel. That's insane.

A rational society would have shut those companies down and thrown the executives into prison.