We've killed(supposedly) Iran's leader, we've killed dozens of innocents, we caused millions in damages, we spent a few billion on armaments. So now what, are we going for regime change, like that has ever worked out well for us. Are we just going to drop several more tonnage of bombs then pack up, declare mission accomplished and go home? Are there going to be boots on the ground? What's the mission objective here, is there one? Only future plans that I've heard is we're going to bomb Iran for at least a week, after that who knows.
Starting a war with no defined goal or plan is a sure fire way to defeat or at best a quagmire. Expecting that things in Iran will miraculously change just because the leader is dead is foolish, there is always another leader to take his place. And just because there are people celebrating the death of the Ayatollah inside Iran doesn't mean that they suddenly love the US. They don't, for numerous reasons that date back to beyond the CIA coup in the '50's, all the way up to today's killing of innocents.
This is going to be an action that will have repercussions for years and decades, most of which will not be good for us. This is just another stupid, foolish move by Trumpco, and sadly we're all going to be paying a steep price for a long while.