“I'm proud of my invention, but I'm sad that it is used by terrorists.”
As quoted in "Kalashnikov: 'I wish I'd made a lawnmower'" by Kate Connolly, in The Guardian (29 July 2002) https://www.theguardian.com/world/2002/jul/30/russia.kateconnolly
Context: I'm proud of my invention, but I'm sad that it is used by terrorists. … I would prefer to have invented a machine that people could use and that would help farmers with their work — for example a lawnmower.