The culture in the GOM isn't going to change soon, no matter what those on the other side of the pond may think, or how much they pontificate. The US cares not at all about ICAO or any rules or regulations anyone in Europe or elsewhere may have. The oil companies care about short-term profits, and nothing else. If people die, well, that's what insurance is for, and the cost is easily absorbed, being more than made up for through savings from not actually having safety policies. Actually, there are many safety policies, they are just ignored by field personnel, with the implicit agreement from management. Thus the refinery explosions in BP facilities, chemical releases from plants everywhere (in Texas, all monitoring is done solely by the companies, the state doesn't even bother). You Brits can feel superior all you want, but the British management of the companies doing this are fully complicit in all of it.
If it doesn't happen in the UK, then who cares?