If they use chemical weapons they very well might get some other nation’s nuclear weapon. Just not the way they’d prefer to get them.
“......they very well might get some other nation’s nuclear weapon.......”........
The best alternative all the way around, nuclear bombs might indeed wipe ISIS off the face of the earth. It would take out several generations, young and old, the Islamic haters who would kill all of US if the had the chance.
One hears rumors that Vladimir Putin is more than ready to ‘donate’ a few.