Isn't the "cultural attaché" the guy who hangs out at receptions scouting for other-side folks who can't hold their liquor and/or want to reach out ?

Anyways always remember the difference between diplomatic immunity and consular immunity. The former covers the nuclear family, and includes criminal activity. The latter most decidedly does not.

There was a case where a Brazilian (IIRC) diplomat's kid killed a local in a traffic accident. Off scot-free.