"War is inevitable" - classical realism
Anyways, this issue is not singly about Iran dominating Israel. It's about Iran trying to dominate the entire Mid-East. That's why the Arab states are against Iran. Some are probably motivated by religion, but mostly I believe its competing for regional power. If Iran has nukes, then it can do whatever it wants and be sure that the U.S. won't respond with as much force as they would otherwise.
What Israel is doing is smart. Other nations have been using asymmetric warfare against Israel for years, so its fine time they found an indirect way of attacking Iran. What better way to destroy a nuclear program than to kill the knowledge at its center. Also, anyone notice all those explosions at military bases back in November? And Stuxnet? Israel doesn't need to go to war at this rate and depending on what the IAEA reports they might have the support of the global community in an attack as well.
I think we can all agree here that nuclear proliferation is a bad thing, and we should try to stop any nation, regardless of who they are (Sweden, Spain, Argentina, Gabon, etc) from getting nuclear weapons.