Except that for Americans specifically, relying on the embassy for support and evacuation when a regional crisis arises has been a safe bet for nearly 100 years.

Certainly in the post-WWII era, if you followed the advice of the state department on not traveling to really dangerous places, and didn’t do something to get yourself into trouble (like getting involved in crimes), the US would use considerable resources to ensure an American citizen’s safe passage home. In fact, the hostility to Iran has some basis in the fact that Iran took over the American embassy during the revolution in 1978 and held the personnel hostage, a pretty blatant rejection of standard diplomatic norms. From a legal standpoint that was effectively an invasion of the US because an embassy is sovereign territory.

So regardless of your wording, this represents a pretty basic shift away from previous norms, especially given that the crisis people are fleeing is entirely a creation of the US government.