The "WMD debacle" as you put it drained trillions of dollars from the US economy and has contributed to the major failing and inability of the United States to recover from the GFC. So trivialising the Iraq war as a "WMD debacle" is very disingenuous and belies the enormous, crushing scope of the problem.
And you don't think a nuclear strike anywhere in the world would be a greater calamity? Not to mention the necessary consequent war would be just as taxing as the Iraq one.
At the end of the day, if an Iranian nuclear strike does occur in the near future, Obama has a lot to answer for. That wouldn't absolve Israel's leadership either, who should be doing more than they are as well. (Having said that, I assume that
this happy news was the work of the Mossad)