If you're old enough...
...you will recall the Emley Moor TV mast falling down one winter. At the time the official explantion was that the weight of ice.
Yes there was a lot of ice on it, it was an icy cold stormy winter night, but that wasn't what brought the mast down. Not long after the Emley incident the identical mast at Belmont was fitted with fifty tons of chains dangling down the middle of the mast, effectively this damped down any harmonic vibrations caused by the wind. That's right, the collapse was deemed to have been caused by catastrophic harmonic vibrations set up by the wind (Tacoma Narrows bridge anybody?). Of course the powers that be never shouted about this because it was convenient to blame the weather rather than a design flaw.
Blaming the weather wouldn't really wash in the case of a wind farm. After all the turbine should surely have been designed to cope with bad weather. Blaming the wind for the failure of a wind turbine would probably cause outrage in the pages of the Daily Fail. However once you've eliminated manufacturing flaws, design flaws, operational errors and the weather there's not a lot left appart from UFOs and criminal damage. Claiming the latter would lead to a police investigation which wouldn't necessarilly generate the sort of publicity that they want. Of course they wouldn't be so silly as to blame a UFO, but if somebody else conveniently mentions the possibility and they refused to rule it out what harm could that do?