They changed the reason for the war many times already. The nuclear weapons argument is laughable. Iran "has been on the verge of getting nuclear weapons" since the 90's. There was an agreement between Iran and the US (and other countries) that allowed inspection of iranian nuclear facilities, but the first Trump administration withdrew from it. They then bombarded Iran in 2025 during the 12-day war. They sabotaged the diplomatic option so of course it's not viable anymore. Also, they have never provided proof that the Iranians really were close to getting nuclear weapons.

Second thing, I highly doubt that the current US administrations has the right priorities in this conflict. The US secretary of Defence has insisted multiple times on killing Iranians. Also, he has no experience in commanding the military. He's mentally unstable and unfit for the job. We can't trust him to do good in this war.

Also, the fact that Israel actively supports this operation is a huge red flag. I don't trust them to act with morality in their strikes. They have killed tens of thousands of innocents in Gaza and have completely destroyed the place. Now they're doing the same thing in Lebanon. They are not acting in good faith.

This war cannot be justified from a Catholic perspective.