Kind of an over reaction by the US goverment prohibiting travel by goverment employees on all ferries to Cozumel.
I disagree.
The Department of State is charged with all sorts of things, including the safety of US government personnel abroad, even if they're on vacation. Government employees are more likely to be targeted for attacks or kidnapping, for example. if you read the website, STEP warnings, or other warnings, many of them include prohibitions for government employees that are merely advice for the rest of us. This one is very limited. There are no warnings about flying into Cozumel (or kayaking, swimming, or taking some sort of currently-nonexistent private charter), just about using any of the ferries until this is sorted out. If they don't do this with the currently-available information and a vacationing marine gets killed in a ferry explosion, nobody would ever forgive that.
This'll make it potentially more complicated for my brother to get to the island if he wants to go right now, but it wouldn't keep him from going.