Can we make a conclusion about Iran's motives?
To be sure, there are also ample reasons to argue against a military response at this time, and the United States must be equally careful about gratuitous escalation and unforeseen consequences. But the severity of this threat is significant enough, particularly in what it reveals about Tehran's new strategic calculations about its latitude to target the United States, that we at least consider a kinetic retaliation among the options. [Emphasis added]
I think this is the nub of the issue and what makes the details of this assassination plot so strange. Several people who know far more about Iran's Quds force than I do have made the point that it's an almost comically amateurish plot. That bolsters the argument that it was a "rogue" element acting beyond its remit. In that case, it's too early to draw any conclusion about Iran's "strategic calculation" much less make a potentially consequential response on the basis of that conclusion. On the other hand, every organization makes mistakes, even catastrophic ones, and so sloppiness shouldn't necessarily foreclose the possibility that this was approved at the highest level.
In that case, the administration does have an urgent priority to restore some measure of deterrence to the U.S.-Iran relationship.