Isn't it odd that we are completely fine with thousands dying every day from starvation, ethnic cleansing, machetes, small arms. But the Red Line is as soon as it is a chemical that kills people from a chemical reaction to the body as opposed to indirectly (e.g. explosives). It is INSANE!

I do not see there to be a "solution" to this one. After WW2 many Germans were ethnically cleansed from Poland and elsewhere. And there appears to be no rancour (barring a small minority). Even if by some miracle every there was the way to sort people in that area by ethnic / religion / political outlook they'd of course instantly be a war to claim more land that was viewed as "ancestral" by one or all of the groups.