Yeah.
And they really only exist on the internet.
No one in the military structure up to the President wants to launch those things unless we have too.
Aside from the human cost the middle east probaly won't be habitable for a long time, chances of us getting oil in area that has been nuked is slim... That would cause a huge crisis in our economy. Besides I don't think oil and radiation mixes to well...
I think some of them may not really mean what they say and are using the internet to let off some steam. But there's others that sound as serious as a heart attack.
And I also agree with you. Neither the President nor those in the military chain-of-command, nor anyone with an ounce of sense, would want to launch a nuke unless it was the last resort.