@couiza
I can't understand it myself either. Weather forecasts are a major part of pre flight and in flight checks I'd have thought. Surely if a pilot sees big problems arising at a particular airport e.g. Dublin tonight s/he would either delay take off to see if weather improves or cancel the flight after a few hours.
And if pilots ran airlines...........................but they don't.
The captain/crew's job ultimately, in a nutshell, is safety of passengers and crew...decisions on whether to run flights on days like today usually end up with operations, they consider the pros and cons, including the possible costs caused by pre-emptive cancellations (the sort of thing @EasterIssland has mentioned).
The early forecasts I saw for today for the likes of e.g. Dublin were that the wind would be high but inside (most aircraft's ) limits, other than for brief periods in gusts. Just my VHO but from a pilots POV it was perfectly reasonable to go flying as long as crews had a plan for the weather not being as forecast...
I suspect most crews plans was probably to load up with a reasonable/maximum amount of holding fuel and to make sure the nominated alternates were good from weather POV....then get on with the job, with an eye on weather, limits and diversions. If you look around this evening that all appears to have worked out.
So please don't blame the pilots and/or captains please....