This is truly an escalation, however what does Iran expect will happen if it attacks US interests and personnel in the Middle East? It will get a response, and perhaps this could be a prelude for future bombing campaigns of Iran. This can get messy really fast if cooler heads don't prevail. On another note, I am still confused as to why Iran wants to control the ME? Is the benefit of controlling Shia militias in Iraq worth the cost? What does that bring Iran? What does Assad bring Iran? I really don't know why Iran is actively engaging in wars across the ME, I just don't see the benefit apart from an ego boost. Iran is massive, focus on your country and your people and stop wasting lives and treasure across the ME for nothing.
Storming embassies, fueling religious divide in Iraq which has already seen too much bloodshed, and covert efforts from Lebanon to India. What for?
Not to say the US is an angel, far from it and I don't support US foreign policy in the region and many other areas of the world. However, the US will come and go with time, but you're going to remain there so why not use time on your side, soft power, good neighborly relations and live a happy good peaceful life. However, the hubris is real and a clashes will continue. Poor people.