All this rot about "safety first" does get very tedious ! The FIRST obligation of any independent airline management is to make a profit ...............it is absolutely pointless having the safest airline in the world if it's continuously losing money.
The clever bit is to keep your airline safe at minimum cost. This means - among many other things - trying to fly your advertised schedule despite the weather.
Ask yourself - we could all make our cars or homes 1% safer by spending 50% more on running costs but do we do it ? No, because we consider that the additional safety margin wouldn't be worth the investment.
Would a commander be entitled to divert if the weather condition at his destination was above his landing limits ............but he had an opinion that it was dangerous to do a cat 3 landing - although everyone else was successfully landing ???
In terms of safety he's absolutely right - how unsafe is it to land on a runway you can't see..............but commercially it would be unacceptable.