First: It's pirated content. I do not have an issue with playing fast and loose with copyright, but Wikipedia shouldn't have started linking there, because pirated content of this volume has the side effect of involving authorities pretty fast. Wikipedia has enemies, they are rich and ressourceful, and this is an attack surface they shouldn't have.

Second: People do not tend to trust others who behave erratically, and when trust is eroded it's not so easy to fix it again. In reality it's this way: nobody knows if the content there has been modified, and trust was the only thing holding all this together.