If I made something that was responsible for the deaths of countless people I would’ve wish I invented the lawnmower too.
"For most people, mowing the lawn is either a chore or a relaxing time to work outdoors. For about 70,000 people this year, mowing the lawn will turn into a brush with death or serious injury. The statistics, from the U.S. Consumer Products Safety Commission, are harrowing: Each year 800 children are run over by riding mowers or small tractors; 75 people are killed, and 20,000 injured; one in five deaths involves a child." (link)
Lesson: Never invent anything. Creation leads to destruction.