That assumes they want to escalate. So far at least their official statements have been clear about tit-for-tat.
It could also backfire spectacularly. If a bunch of civilians suddenly get killed or other war crimes committed unilaterally by them (such as targeting energy infrastructure) their adversaries could gain political support for the current effort. Whereas gradually forcing all interceptors to be expended is a massively expensive slow bleed and gives the opponent little to nothing to spin in their favor.
The strategy of throwing ballistic missiles at all of their neighbors doesn't seem like one that's overly concerned with political support among their adversaries. And a fast bleed of interceptors works for them too, maybe better since it spends less time in this phase of the conflict. I don't buy it. The Iranians aren't stupid but I don't think they're playing 5d chess either.
I agree that it's probably not 5D chess. But I have to contest that speed is to their advantage given such asymmetric military strength. A slow bleed prolongs the process while the world looks on and energy prices steadily rise. They certainly aren't endearing themselves with their neighbors but at the same time by only striking a minimum amount of infrastructure they avoid mobilizing the sentiment of the broader US or EU populations against them.
My impression is that an overly intense or otherwise disproportionate attack would risk inviting a significant increase in political support. Whereas so far it seems to be a wildly unpopular military campaign.
IMO the US botched this quite badly. I'm almost certain we could have found a way to go about disposing of someone who guns down protesters en masse and funds terrorism without inviting so much negative sentiment or economic volatility.
It could also backfire spectacularly. If a bunch of civilians suddenly get killed or other war crimes committed unilaterally by them (such as targeting energy infrastructure) their adversaries could gain political support for the current effort. Whereas gradually forcing all interceptors to be expended is a massively expensive slow bleed and gives the opponent little to nothing to spin in their favor.