>>1 About the history of Nukes, I'll agree that only two (so far) have been used in wars....globally, nearly every major nation has used a crapton of said nukes in "weapon testing". Which leads to irradiated uninhabitable areas. The total count is somewhere in the middle of this
Movie. Just pointing that out.
Imo...though war is unavoidable in certain cases, the usage of WMD in war is. you're trying to win the war, not wipe part of your home (Earth) off the face of the...Earth. The problem is not only with how much destruction is caused, but also the fallout and negative side effect the "leftovers" from the initial blast will have on the environment.
They seem pretty useful for getting rid of planets though, if we ever find a use in doing so.