These conventions don't matter unless they're actually enforced. For example, gas shells were banned 16 years before their use in WW1 by the very countries using them. Lots of victims lived horrible lives of suffering or killed themselves as a result of their use.
https://en.m.wikipedia.org/wiki/Convention_on_Certain_Conven...
https://en.m.wikipedia.org/wiki/Protocol_on_Blinding_Laser_W...
These conventions don't matter unless they're actually enforced. For example, gas shells were banned 16 years before their use in WW1 by the very countries using them. Lots of victims lived horrible lives of suffering or killed themselves as a result of their use.