Uhm, yeah okay. That has nothing to do with what you initially put forth.
Also, lets not forget nuclear weapons themselves were new in WWII. Lets not forget the use of them was neither banned, or investigated. WWII saw the first use of nuclear weapons, much the same way WWI saw the first use of mustard gas in trench warfare.
WMDs is a new term- it actually didn't come 'bout till the 60s, so using your argument that gas wasn't banned, neither were nuclear weapons, and they were not WMDs either. They were just big bombs.
Tear gas does indeed have an effect, but nevertheless, the Germans did indeed use mustard gas in WWII. And it did indeed have an effect.
I did like how you immediately jumped to apology mode for what the Germans did though, shows your true colors.
Sieg heil!
-SW