Trump has consistently said Iran must not have nukes. While he claimed they were previously destroyed, other sources and assessments merely indicated damaged. Israel would certainly have provided accurate intelligence to him to show him he had been mistaken. At the outset of this conflict, he repeated that we would destroy their nuclear abilities.

That he wanted regime change is very clear from his remarks upon the death of Khamenei when he indicated that this was a good time for Iranians to rise up and remove the government. Khamenei and the leadership were openly targeted.

But, these things are not clear to you because you don't want them to be. It is plain enough to others.

Yes, Iran can restart their nuclear program. "Restart" is the operable word. If their facilities and leading scientists are gone, the effort will be greater, and it will take longer. That is that much more time that Iran is not a nuclear menace to the region. And future generations and leaders can monitor and decide what to do about it in the future. They might get struck again. And Israel is another player.

Yes, control of Iranian oil would also be a valid objective. If we controlled their oil, it would "complicate" China's energy picture. Another strategic goal.

People complain there is no exit strategy. What could be better than being able to exit whenever you decide to? I'd say that's a fine exit strategy.

He has stated he feels his objectives to be worth the costs. You disagree, and would not be alone. Nothing wrong with that.