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!

I’ll give it a shot. Zippers/velcro are critical for most modern military gear. Elevators are used to increase the storage capacity for warplanes on aircraft carriers. Thermometers (well, any temperature sensing device) are important for many weapons systems, guidance computers, etc. Wind turbines… hmm, the infamous Stuka siren was basically a wind turbine welded to the side of the plane!

(This is mostly facetious)

Going back in history more: aqueducts, looms, pottery, and baths were not really ever weaponized.