K of H.
It is a distinction that UK government and others do make when deciding what defence items are permissible to sell.

Yes but there are many ways around such distinctions when the mood suits. Also many governments may not share the same ethos.
Perhaps you have forgotten French exocets and technicians working for the Argentinians during the Falklands war.
Or perhaps a close look at who founded, funded,and still trains and supplies isis.

In reality those distinctions are meaningless.

Perhaps a close look should be taken at the use of depleted uranium scattered like confetti by coalition forces in recent wars. A WMD in all but name.

2 links below can they both be correct? Is one a massaged whitewash or is one a gross exaggeration.?
http://www-pub.iaea.org/MTCD/publications/PDF/Pub1164_web.pdf

http://users.physics.harvard.edu/~wilson/soundscience/Al-Azzawi.pdf