It is funny that some of the same people that claim that using and sharing other people work is ok and that copyrights and IP are evil also think that what Zyng

It is funny that some of the same people that claim that using and sharing other people work is ok and that copyrights and IP are evil also think that what Zynga did in this case is "stealing", "rip off" or immoral, at best. Why would it be ok to just copy other people work and enjoy it, while creating something similar to something else is not ok?