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It’s pretty well known that Hamas and Hezbollah are Iran funded no?
They support the Hamas offensive, though not claiming any credit.The US knows this, and also knows that a variety of Islamist terrorist organisations are not so covertly funded by Iran (which is why there are so many sanctions).
The US protection and support for Israel is probably the only reason why Iran (and other neighbours) hasn’t tried a full scale invasion of Israel already.
Don’t think there is any political advantage of invading Iran.
I don't see what else it could be, either.
The cost in lives will be an order of magnitude higher than where this stands today.