Being put under pressure by the company and/or clients can cost lives. Two days ago a helicopter crash in similar weather in the USA claimed 4 lives and it will be interesting to compare the reports when the latter report is finalized.

http://aviation-safety.net/wikibase/wiki.php?id=182196

I used to fly a night freight operation on the Shorts Skyvan , one night we refused to go because of the weather. During that night a charter flight flown by an ex airforce pilot disappeared, they found the wreckage 6 months later in mountains, probably 100 miles off course.