No-one believes that Iran is not pursuing nuclear weapons, either... or that they wouldn't if they had developed the capability.
This practice is known as taqqiya. It’s ok to lie if you’re deceiving the enemy.
Because otherwise you're comparing apples to mushrooms. Not even themselves kingdom.
“ A weapon of mass destruction is a nuclear, radiological, chemical, biological, or other device that is intended to harm a large number of people”
https://unterm.un.org/unterm2/en/view/UNHQ/9626F6CEB2A92C9B8...
https://en.wikipedia.org/wiki/Weapon_of_mass_destruction#Def...