Read other letters about this article
Yes there are potentially more life threating global issues worth discussing on the front page, but Harry Potter is global cultural phenomenon that can't just be ignored because some of us don't like it.
And yes, just saying "warning spoilers ahead" doesn't really excuse the fact that spoilers were included, unecessarily; it didn't really help the progression of the review in my opinion.
But guess what, its there! On the front page! Deal with!
This sounds trite, but: don't read it, don't click on it, don't even pay attention do it if you don't want anything to be spoiled, and especially if you aren't even interested in the topic being discussed.