I don't recall the houthis disrupting shipping before 2018. The status quo under before that point was fine for the global economy and for the US. If it wasn't fine for Israel, that's a problem for their own military to deal with, ideally without US backing that drags other countries into the issue.

Good luck with non proliferation but I think the very obvious "we can attack and invade countries without nukes but can't do that to countries with nukes" lesson is being demonstrated to everyone, so countries that don't want to be invaded will be trying to get them now. Anyone near Russia for sure, possibly even Switzerland eventually.