I reject the idea that Iran would launch a nuke at first opportunity any more than I think NK would, which has been proven accurate and NK is just as or more insane as Iran is. This is the same kind of argument around Saddam's WMD's, that is we have to act before he does something terrible. So far you are correct on one count that the cost of this war hasn't been that great, but it is teetering on the verge of something much larger. I'm warning against making the same mistake again. I support selling arms to Israel as I believe it benefits our defense industry, but that's where it should stop. And beyond all of these points, when the POTUS is an unmitigated disaster of a decision maker it behooves us to stand against him getting us involved in another Middle Eastern war even more. This all also just glosses over the fact that Iran had negligible amounts of enriched uranium when the agreement was in place and only after Trump tore it up did they re-start their program. You can say they would have anyway until you are blue in the face, but the fact is the agreement was working and anything else is conjecture.