Your theory doesn't hold up, even though the USA has a hundred times Israel's intelligence services and a ton of more equipment and money, we did not see 911 coming. Like Israel the USA gets threats daily, it takes a massive effort to keep up and anything that has never happened (yet) rarely gets considered as possible, even with advanced warning.
A better theory: the left knows they cannot win in 2024 especially if it is Biden vs Trump battle, they need a distraction, starting WW3 solves several all dem problems, no 2024 election, massive weapon sales, Bidenomics doesn't get discussed as the major cause of our economic problems, the war would be blamed, everyone forgets about election fraud, covid mandates, Hunter's crimes, the Biden, Obama and Clinton crimes families and more. Attacks here at home by radicalized Muslims get blamed on the dangerous white supremist the left invented and additional crackdowns on US rights are demanded. I think Biden gave Iran the go ahead and a 6 billion dollar advance to attack Israel. Hamas is just the 1st phase.