Call it peer pressure or whatever you want ... but to the pilot he also wants to be a good employee as well as a safe one ... look at Flying Bull post #4 ... he obviously did the right thing .... but his boss (or whoever) did not have use of his million dollar helicopter for a week because it was parked in a snowbank somewhere.
better that than the outcome in this case - no helicopter at all and a dead pilot.
Yes, you could get hassle from your boss and it might cost the company a few quid in lost revenue but at least you would be around to justify your actions. This poor guy will have left a sudden hole in a lot of people's lives just because he couldn't or wouldn't make a sensible weather decision.