We need all the help we can get. This action will exclude the millions of people who use and enjoy adult content. Club founders have put in months and even years of hard work into their clubs. It would be completely unethical to suddenly take away all this hard work. They have received absolutely no warning that something like this would ever happen and have therefore had their trust betrayed.
Many people are in favor of such content, and the rest are indifferent.
Clubs themselves aren't even part of the issue that has been criticized. Adult clubs have always been segregated from other categories, so once again people only find the adult content if they WANT to find the content. Groups like the AFA have found such content because they have wanted to find it. It's interesting to note that most of the world's major wars have been in the name of religion. Yahoo could send a better message by accepting differences than by being biased towards one group.