> We tried the nuke deal and they lied and kept building

This is a lie. A complete fabrication. Trump says this, completely baselessly, without a shred of evidence, as known liars are wont to do. They allowed inspectors in and not one of them ever suggested they were violating the terms of the deal.

> How many have to die for us to decide to act.

This is a murky question, but if anybody was going to intervene in a country's domestic affairs, it would need to be by broad international consensus to have any legitimacy. It absolutely cannot be a unilateral invasion where one country decides who is worthy of invading and who is not. Moreover, that is not why they were invaded. Whatever qualms you have with the Iranian regime, this war is not a war to instate democracy in Iran. We already saw with Venezuela literally just two months ago that Trump invaded and deposed the leader, only to keep the current regime in place with an agreement to serve as his country's economic vassal. Stop projecting your own justifications for why you would invade Iran if you were President of the United States, to justify the actions of the current one who is not invading for those reasons. The only thing you are doing by justifying his invasion for unrelated reasons is giving your support to the death of more innocent Iranians that you ostensibly want to help.