We all need to get a proper sense of proportion here.
1) Helicopters will never be as safe as fixed wing airliners, they have more single points of failure such as gearboxes, rotors, etc and operate in more hazardous conditions.
2) Despite the above the large helicopters used in offshore operations have a good and improving safety record in terms of incidents per sector flown.
3) The offshore oil industry is totally dependant on these machines and safety is their number one priority.