Interference in the form of bombing the Iranian reactors (if that's even feasible) depends on what you believe Iranian motives are. The way I see it, there are (more or less) 5 possibilities:
1) Iran is being truthful and is really not seeking to develop nuclear weapons
2) Iran is developing nuclear weapons because they want to level the diplomatic playing field with the United States, Israel and the West, but they certainly don't intent to use them.
3) Iran intends to use its nukes to bully Israel into dissolving or making massive concessions and/or to do the same to western countries
4) Iran doesn't intent to use them, but will sell them off to terrorist groups (or allow terrorist access in one form or another) who can use them against western or Israeli targets.
5) Ahmadinejad and the Mullahs want the bombs so that they can immediately nuke Tel Avi and New York and go soaring straight to Heaven and claim their 72 virgins.
If 5, then Iran must be stopped at all costs, including air/ground invasion. I have trouble imagining anyone would even argue with that.
If 4, basically the same applies.
If 2 or 1, then there is no urgent need to go in or bomb the reactors from the air.
If 3, it's a closer call; but I still would say that an invasion or attack is probably not justified.
You who blithely rest in your armchair and scoff at any necessity or justification for stopping Iran assume 1 or (more likely) 2. Most of you have the luxury of doing that. Fundamentally, you don't care whether New York or Tel Aviv gets nuked, Sure, you'd rather it not happen, but you're plenty willing to gamble other people's blood for the substantial chance at peace.
I too, hope that 1 or 2 is correct.
I am deathly afraid that 5 is a possibility. It sounds so horrible that you dismiss it out of hand. But, if you take MA's words at face value, I don't see how you can dismiss the possibility.
I think that 4 is a substantial possibility, though still probably less likely than not.
I think 3 is more likely than not.
Would I go in and bomb the reactor if there was no other way to stop Iran from developing nukes? Gee, I don't know. It would be the most critical cost-benefit-risk analyses in the history of the World. I wouldn't want to have to make the decision.