The considerate thing to do with a spoiler is to warn people that it is a spoiler at a point where they still have the opportunity to not read it. This is universal fandom etiquette. On a messageboard, it takes the form of spoiler tags so the reader can choose whether or not to highlight the text underneath. In a livejournal or LJ clone community, it takes the form of "spoilers under the cut," so that people who do not want to be spoiled can choose not to click the cut. Which is exactly what I did here.
If anyone read these pages before reading the issue, it is because ze wanted to. There is no lack of consideration in a spoiler-tagged spoiler.