This is the sort of idea that gets momentum just because people don't find it easy to recall counter examples on the basis the idea puts the problem: most people aren't mentally indexing tech on a weaponized or not basis. Therefore to validate the idea they need to do a scan of technologies in their memory, many give up and just accept it.

Fortunately as people here demonstrated there are a myriad of counter examples.

I look forward to someone challenging Brown regarding the weaponization of the dishwasher! And the zipper, velcro, food processors, air-conditioning, elevators, escalators, weighing scales, thermometers and wind turbines!