Second of all the Kurds don't have a army to fight a country of 90 million people, they will get massacred
From the lens of Israeli and American hardliners, the goal here isn't for the Kurds to swallow up the entirety of Iran, but for Kurdish separatists to carve out an autonomous mini-state inside Iran — Iranian Kurdistan, if we're to call it that — as they did with Iraqi Kurdistan inside Iraq.
Likewise, just as Iraqi Kurdistan effectively — but somewhat discreetly — hosts a permanent US military presence, so will Iranian Kurdistan, should it be "liberated" by Kurdish . . . I mean freedom fighters.
If things pan out for Washington and Tel Aviv, Iranian Kurdistan will serve as a base of operations — for collecting intelligence, training insurgents, and launching drone strikes, among other activities — that will weaken and disrupt, if not destabilize, the government in Tehran for years, if not decades, to come.
Third of all This could spill over to other countries like in Iraq in a Shia uprising and Turkey.
Those are features — not bugs — as far as the Israelis and their friends inside the Beltway are concerned. The Israelis have already declared the Turks as next up on their hit list:
Even though going after Turkey clearly runs counter to long-standing American interests — if for no other reason than Turkey's geostrategic location and significant contributions to NATO's force structure and overall posture against Russia and in the Middle East — the current administration is most likely going to let Tel Aviv get its way.
For whatever mysterious reason, Trump just can't say "no" to the Israel lobby . . .