Idk about "just sending a message". Israel has sent many of these messages (too many to count) but this most recent round was meant to draw blood and destroy infrastructure. My gut feeling is telling me that they want a stronger reaction from Iran in response to these attacks: attacks that can vary in intensity however IDF seeks fit, ultimately to iniatate a larger regional conflict. Possibly taking away the pressure at home with an existential conflict will help Netanyahu domestically but it might open up a can of worms not even him and the IDF can control what the outcome will be. --Clearly a shooting-war is just around the corner. It's the when, where and who will start it first, that's the million dollar question.
The ball has been in Iran's court for quite some time now regarding these strikes. IRGC has the capacity to increase the level of hurt against Israeli assets. Either they put up or shut up...