Of course, it's relevant. We've no business intervening on the side of the rebels if they are the ones who used the CW.
There are women and children being killed with CW, and I cannot stomach that.
Can you stomach women and children being killed with rifles and machetes?
The jihadi rebels seem particularly prone to massacres -- especially the Aliwite and Christian minorities.
I get you. Rifles/machetes=use of WMD. Moving along.