I'd prefer companies not help the military develop the most powerful weapons possible given we're in the age of WMDs, have already had two devastating world wars and a nuclear arms race that puts humanity under permanent risk.
So would you have preferred the Nazis to develop the most powerful weapons and they win the world war? (which they were trying to do?)
There is an extremely straightforward argument that WMDs are precisely what prevented the outbreak of direct warfare between major powers in the latter 20th. (Note that WWI by itself wasn’t sufficient to prevent WWII!)
You can take issue with that argument if you want but it’s unconvincing not to address it.