This is hardly "... “the first time that the public is getting word of practical preparations of military activity.”
The US public has been getting "groomed" for such an operation for years, by various bits and pieces of propaganda, coupled with disinformation.
This drive for war, orchestrated by Tel Aviv, in which American kids will fight, get killed, or maimed for life, has absolutely nothing to do with Iran's peaceful nuclear energy program.
Just as happened in Iraq, the US will be called to neutralize yet another non-existent "existential threat" to the Jewish state.
The bottom line here is, no country in the Middle East is safe until Israel is stopped from indulging in its consistent territorial aggressions.
Unfortunately, Israel's near-pathological national paranoia, fueled by hubristic delusions of religious supremacy and coupled with demands that it should always get everything it wants, may well create the conditions of its own demise.
Neither Russia, nor China (Iran's number one trading partner) will sit idly by and allow such an attack to happen against Iran without consequences.
It is simply a question of what form those consequences will take.