Saudi Arabia’s decision to declare regional militant and insurgent groups, including the Muslim Brotherhood, “terrorist entities” was strongly favored by a cross-section of Saudi citizens and Arab expats on Saturday. They hailed the Saudi decision, saying it is “an important move in the right direction,” while calling on Arab states to unite against nations and groups promoting terrorism. Well-known columnist Abdul Rahman Al-Rashed said many groups were organized in the name of Islam, “jihad,” and the oppressed. Some of these groups had political projects, while most were armed groups with violence on their agenda, he said. “These groups claim that their external activities were against their enemies, while in fact, their ultimate target is Saudi Arabia. There is no need to argue about the validity of the accusations against groups that...