I can't see how that's sustainable. From what I've read, many of the ultra-orthodox devote themselves to religious studies & don't work. A large & growing group that refuses to help defend an embattled country, & much of which declines to contribute economically, is bound to provoke resentment.
That's the point. It's not sustainable and there is already unprecedented resentment and growing points of division. The demographic, economical, and political trends are unfortunately quite negative.
Thats just my humble opinion of course, but I dont see why in the world Israel would launch 3 suicide-drones against Iran in this particular moment of History ( Iran's struggle with protesters ) and while engaged in large scale military maneuvers with the US.
I'd say it would be at least " stupid " to strike Iran now ( with 3 useless suicide drones??? ).
My guess would be drones from Iran itself to try to distract from the protests? Or terrorist attack from organized protester groups/military groups or even organized societies like the Curds.
But thats just my 2 cents, absolutely unsupported by evidence.
Israel is not engaged in maneuvers with the USA at the moment (they ended already), and even if it did, it wouldn't have mattered as Iran has better ways to determine who's responsible.
Also, Israel's national security takes a precedent over Iran's own, plus of course this adds substantially to security in Europe (Ukraine).
Protesters are anti-government, and they would not believe a government narrative, and many would even support anti-government actions like this.
At least Iran's diaspora overwhelmingly supports such strikes, and I assume they are not ideologically far from the protesters.
Finally, we have no way of telling what exactly was the point of the strike. Previously, Israel was able to destroy a factory containing hundreds of drones. But that may not necessarily be the point right now. Many aspects of production could be hit.
For example, if Iran intends to produce a batch of 1000 drones for Russia, for which it needs 3 months to source airframes, 4 months to source motors, and 5 months to source optics, then targeting only the optics would yield the same result as destroying the entire factory.
Large coordinated strikes are not an infinite resource. Iran analyzes the attacks and works to reinforce previous exploitation points. And destroyed facilities tend to be rebuilt more resilient, sometimes even underground.
At some point Israel will have to escalate to the point of a sweeping strike, and conducting large individual strikes til then would only hurt it in the long term.