I believe the term premature is apt. Without a solid set of terms and agreements on Iran's Nuclear Program there is nothing to judge as unwarranted or not. both Israel and the Sunni Arabs have a very strong economic interests in keeping Shia folks deep in a box.
I think the whole terrorism support in the Middle East debate is better inj the ME section, but what has been said so far shows how convoluted the history of 'terrorist' support has been and one side can use military road blocks and settlements while the other side uses suicide bombers and rockets in attempts of getting their way in the region.
Israel has a very strong INTERNAL political reason for keeping a 'far' enemy in the region and making them the focus on why they have a 'near' enemy. It does help keep form having to assess your own actions in the situation as a trigger/ sustainer of violence.