When the subject of Le Mans 1955 comes up, the conversation inevitably turns to allocation of blame for the disaster.
It is both futile and impossible to allocate all the blame to one individual. Hawthorn made a mistake by overtaking Macklin when he didn't need to (he was heading into the pits after all) then slamming hard on the brakes forcing Macklin to also brake hard. Macklin's mistake was to try to avoid running into the tail of the Jaguar by swerving to the left, into the path of the speeding Mercedes.
The ACO were to blame for allowing the race to be held on a circuit that had hardly changed from the 1920s but with post-war cars capable of nearly double the speed.
The designers of the sloping tail of the Austin-Healey 100 were inadvertently to blame by effectively creating a ramp that launched the Mercedes.
Mercedes designers were to blame for building a car that was lightened to such an extent that it disintegrated on contact with the earth 'berm', and although the main structure of the car remained near the point of impact, it shed major parts into the crowd.
None of the people involved either intended, envisaged or expected the turn of events that terrible day. A number of factors combined and coincided to make it happen. One thing is certain though, Hawthorn took the fatal decision that unfolded into the disaster. Was he to 'blame'? I'd say that he does carry some blame, but certainly not alone, and anyway, allocation of blame will not bring back the victims nor change history.