Its impossible to shut down all forms of games or websites simply because they're controversial. If a game is popular enough, new games will spring up in the absence of the first. There is nothing inherently wrong with any of these games, and hatred of them is ultimately due to a fear or misunderstanding of new technology.
Online games such as Habbo are harmless fun and should never be closed down for any reason. If people want to use their free time to play online games who is to say you cant? What did Habbo ever do to you? Like excuse? I think the concept is ridiculous.