Epiphany,
The idea that regulations, ICAO or otherwise, would have changed anything in this accident is interesting. I'm assuming a lot when I guess what happened here, but if the accident aircraft did indeed hit the rig over the production platform as he tried to land... I have to ask if a natural amount of apprehension of a potentially lethal hazard wasn't sufficient, why would a rule be more effective in preventing the attempt? My decision flow chart starts with personal survival, then preventing damage, then complying with laws, and doing the job is last.
No, I don't think the GoM operators "laugh as loud at each new fatality?" as they might chuckle at the idea that rules against mistakes are effective.