They hardly pay taxes in the U.S. so they deserve no protection. In fact, I'd encourage Iran to attack them. You didn't pay? You're delinquent? No I will not protect you, ya gotta pay.
Also, why are US corporations operating in Israel? I think Iran is justified in their actions but also feel it benefits us in the US to have US corporations hire here instead of in Israel. It also removes the moral hazard of having to work with an apartheid state engaged in a genocide.