As long as you have enough fuel, why not?
Just as it's legal to depart to destination either with weather well below minima or even without any current or forecasted weather.
Thank you FlyingStone.
The term "closed" made little to no sense to me. It sounded like a scam to save alternate fuel. (if the alternate was the "true" destination)
It's true, after all, if you have an alternate with all the requirements then ... why not?