It's quite simple, really. People are expressing their opinions about Wizards' actions because it's something they can (at least theoretically) effect. Wizards has changed course and can hopefully change course again. Look at, for example, DriveThru dropping DRM.As I said in the 'Weaning off the Sauce' thread, I've let it go. Yes, I'm not happy that I can't buy .pdf files anymore, but don't any reason to punish myself (not playing or buying D&D) to protest.
Also, I don't see why so much anger is directed at WotC while seemly less anger is directed toward the pirates that caused this action in the first place.
Where is the outrage against the piracy? It seems like they get a free pass just because they seem unstoppable.
Raging against the pirates does no good. There isn't even a theoretical chance of having any effect on them, so why bother?