Hezbollah isn’t a terrorist organization; it’s a state within a state. It has obligations to its constituents in Lebanon. It has plenty of power in Beirut, too. In other words, it has a lot to lose in a war with Israel. As a result, it has been relatively responsible over the last few months; it has lobbed a few missiles at the Israelis, and made life at the border impossible, but it shows no interest in starting a full-scale war. I don’t expect that to change any time soon.
The Houthis are a different story, even though they are also a state within a state. Having beaten the Saudis, they are suffering from delusions of grandeur; they probably think if they suck us into a war on their terms, they can beat us, too. It won’t happen. American military action against them will be solely focused on maintaining freedom of navigation in the Red Sea.
The pro-Iranian militias in Iraq are even worse. What are they trying to accomplish by attacking American bases outside of the country? Do they think they have the power to drive us out of the Middle East? Do they think weakening the international effort against IS, which just killed hundreds of people in a despicable terrorist bombing in Iran, is a good idea?
What they are actually doing is creating a threat to Iran. The Iranian government needs to get a grip on these guys as soon as possible.