Yes.
But HOW?
That's the rub.
We have to stop them.
But we CAN'T stop them.
So we have to figure out how to deal with a nuclear-armed Iran.
The Iranians aren't bluffing, but we and the Europeans are. The Iranians know it too, and keep calling the bluff and moving ahead. Once they have the weapons, the Europeans and the Americans will storm off in a huff and issue something strongly worded to the effect of "We are VERY put out!" and then we'll have to deal with a MAD situation with Iran: they don't nuke Tel Aviv, the Israelis don't nuke Teheran. Worked against the USSR. It's all we've really got against Iran, because the will's just not there for a war.