Valle himself is a cop who stalked his intended female victims on paid time using police resources. He described graphically how he wanted to torture, dismember, and kill them. One was his wife and several were women he knew previously who didn't reciprocate his sexual interest. He gave out their identifying details, which he obtained using his position of authority, to a bunch of psychopaths who are clearly willing to act.
These are all specific, credible threats of murder. If the power dynamics were different I wonder how this thread would go down? If, instead of a message board for men wishing to kill women, it were a message board for Muslims wanting to kill Christians, would you react the same way? What if specific people have been targeted - would you defend the aggressor's right to free speech over the targeted's right to live? What if the aggressor's friends were found carrying everyone they needed to torture and kill the targeted? Would you really defend that free speech?