Apparently they did drop an anchor.
There would have been a harbor pilot on the bridge, so there’s that.
I don’t know if the, actually, drive the ship.
My first thought was this was terrorism, or more so assymetric warfare, where the goal was not a mass casualty event, but something else.
The Russia / China / Iran axis wants a war with the US, while Pedo Joe is in office.
This fits in, well with that plan.
The goal may have simply been testing the waters.