First, a brief introduction. I, too, think the current President and Vice President are dangerously eager to cause trouble in places like Iran. They are conniving bastards, in fact. However, I have some Real World experience in these kinds of affairs and this experience makes me scratch my head when people get all worked up over this kind of incident.
That said, here we go!
In the world, there are groups of people that do not particularly care for each other. There are probably unreasonable people in your own neighborhood. We are all aware of the stereotypical "old guy" who chases kids off his lawn. Unless he opens fire on the kids one day, nobody cares.
The Straight of Hormuz is a narrow channel through which an awful lot of oil and other products are carried by ships through internationally recognized shipping lanes. Since this cargo is considered valuable, two things happen. Those two things are piracy and nervous escorting of all that stuff. The Iranian government (pick any one of them through history) would probably like to control that traffic, much like Russian governments through history have sought warm water ports. You read about that in World History class, no doubt. They probably like to think that channel should be theirs, much like the "English" in the English Channel. They especially resent it when the United States Government moves warships through there. Some of that is envy (i.e., "Gee, I wish we could have cool Aegis Cruisers...") and some of that is ideological (i.e., "America is the Great Satan and here they are sailing right past us!").
Military organizations throughout time have established strict rules to prevent their expensive equipment from being damaged by joy-riding service personnel. Or to keep bored service personnel from amusing themselves at the expense of bored service personnel from another country and causing a war when nobody wants one. These rules are often ignored or have their limits pushed. Violations are sometimes severely punished and sometimes are winked at by superiors who are secretly happy about the event.
Having been in some interesting places in my lifetime, I have witnessed some of these events as they happened. They did not make the news. They did not make the news because there was nothing going on in the world to make that particular place worrisome at the time. Obscene gestures and comments have been exchanged across hostile borders or over contested waters since time began. Hostile forces often test the limits of their local environment to see where the actual limit might be. Sometimes people get hurt doing this and sometimes you get away with it to do it again another day. Usually, it never makes the news because neither force wants to let it be known they were probing for limits, or that the limit had been found.
Let's role play this Hormuz situation for a bit. Let's say you're commanding three really expensive United States Navy vessels and sailing them through waters where you think the locals are crazy. Your career is over if the locals even scratch the paint on one of your ships. If one of your bored crewmembers fires on the crazy locals or if you order your crew to open fire and kill somebody, you'd better have a really good reason to do so or you are in a world of dung. The least that will happen is you give the crazy locals an instant pass to looking reasonable, something you'd rather not do for political reasons.
Now, let's say you're an up-and-coming commander in the Iranian Revolutionary Guards in charge of five boghammer speed boats. Your shore-based radars detect three ships sailing at a speed that makes them appear to be military vessels. Ships going faster than lumbering cargo ships and tankers tend to get your attention, so you speed out to visually confirm the contacts. Or perhaps the radar and communications frequencies emitted from those contacts identify those ships as American. Either way, you get out there and see the ships are, in fact, American naval vessels. One destroyer, one cruiser and one frigate, to be exact. You might view this as the chance to gain some small measure of fame (i.e., "He's got balls to show down the Americans like that!") and to test some limits. How crazy are the Americans today? Can I provoke them to open fire on my puny speed boat and make them look like bullies? Hey, let's drop our empty ration boxes in their wakes and call them on the radio with bogus messages to screw with them.
The American is irritated by this behavior and somewhat concerned about the boghammers maybe being suicide boats (not a remote possibility in that part of the world) while the Iranian gets three American warships go to General Quarters and make the crews pucker up their sphincters. (Making the USN pucker up has got to be worth some laughs at the IRGC O Club later that day.) Meanwhile, the Iranians cruise around having a good time at the expense of the Great Satan's Naval Minions. If the Americans open fire, they lose. If they do nothing, they look impotent. It's like the old man in the neighborhood losing his cool. Yes, the kids shouldn't have been taunting you, but you're big and old enough to know better than to shoot one of them.
In summary, we should not be alarmed by such incidents because they happen all the time and will continue to happen. We should not jump onto any particular political bandwagon or get too excited when we hear about them. Unless somebody gets killed, it's like an international "No-Harm, No-Foul" rule is in effect. We should consider the facts carefully and go from there. If the Iranians really attack us in the internationally recognized shipping lanes, we should kick their asses to protect freedom of navigation, but do so proportionally to the incident. You don't nuke Iran if one dork shoots an RPG at your warship. You blast the offending boat(s) into pulp and sail on if there are no survivors. An official protest is lodged and everybody gets to pucker up for a time.