Abraham, well i will say that one should not underestimate Iran at least...
Irani president have support of its own people, and secondly they did several missile test, which were all succeeded, and for US/UK, its not the same, they didn't win any war in last decades, so they don't have a high moral at the position.
though Iran can't hit or fight longer with america, but they can hit at least there base camps nearby, and secondly a best option for them is Israel, if they did something with Israel, what we expect/need more from Iran.