Mmm... that's the overwhelming force that was available to us in WW2, against a well-armed near-peer country. We have many different and extremely effective means of overwhelming force now, and Iran is not a near-peer.
It would, however, be messy. And most likely it would cause a large number of civilian casualties, and I really don't wish that on the Persians who are subjugated by their government. I just don't have much hope that negotiation can be successful.
And as much bad as there is to say about Trump, I'm not displeased with their tactics in Iran. I'd have preferred that the conflict was never needed in the first place, but I think it's being handled as humanely as it reasonably can be. There's plenty to berate Trump about... but in this conflict they've consistently engaged in short, highly targeted bursts of conflict followed by a pull back and a return to negotiation. Once this war began, it's been extremely tit-for-tat: Iran aggresses in an unacceptable way, and the US responds quickly with immense force directed at well-indicated targets. Despite Iran launching many of their strikes from densely populated areas. It undoubtedly irks some of you to even consider this, but Trump has essentially minimized civilian harm and maximized time at negotiations.