In terms of known weapons systems against "fixed" targets on the ground the U.S. or even Saudi Arabia can deploy F-15E armed with 16 SDB (GBU-39) & fuel pod that can approach from low altitude and fire on targets with deadly precision from 100km away
Saudi's have over 180 F-15E (Which means then can use ~100 in an initial attack and keep 40 in the air every day after)
That means with about 60% of their F-15's in an initial strike armed with SDB's they can take out almost 1000 Iranian targets from outside the range of Iranian SAM's
Even if we had 100 S-300's placed all across Iran's southern cost it still wouldn't make a difference because without interceptors to back them up & strike capability to prevent further attacks SAM by themselves are not sufficient.
As for what Helo carriers are used for depends solely on how Iran chooses to build them and what they choose to arm them with!
Iran's Naval fleet is going to require replenishment ships now we can build or buy replenishment ships that practically do nothing but refuel ships or one with limited offensive or defensive capability
Or you can build around a larger vessel that can not only fuel your fleet but deploy Helo's, armed UAV's, that is also equipped with an advanced Air Defense system and good amount of SAM that can provide cover for the rest of your fleet against incoming fighter jet.....
And during peace time you'll be able to send special forces out with Helo's backed by armed UAV's & attack Helo's to protect your civilian ships against pirates.....
Again your logic is ABSURD! By your logic Iran should never build any ships, aircraft, tanks, IFV, APC,... because the ones the Americans build is superior!!
FYI Our solders would be safer in an invasion if they don't have any military gear at all and are dressed in civilian clothing!!! So by your logic if anyone ever attempts to invade Iran we should just surrender the country from the beginning because our solders will be safer that way! MY GOD!!!!
As for the Subs I specifically said they would disable your ship & then come in for a kill shot! And against modern cruise missiles with modern sensors a 650ft ships with a speed of 30knots is as easy a target as a 800ft ship at 20 knots
Any by your own logic the hull of a large 800ft long ship is more likely to survive a hit than a lighter 650ft long carrier
And the point of building weapons is NOT always about WAR! That is short sighted!