there are no friends at the global scale just alliances. If Europe doesn't want to help then there's no forcing them to. Conversely, if the US manages to get the strait open and oil flowing there's no stopping them from requiring Europe to pay a little extra for the trouble. Fair or not, who's going to stop the other side? You can't exactly ask to speak to the manager.
replyIf the USA manages to get the strait open and oil flowing, then allies might be satisfied with the harms the USA caused, even if there is no apology, much less restitution. At that point, we will be back to the status quo.
replyIf, at that point, the USA perpetrates any sort of further economic attacks on allies, then of course they will respond appropriately.