revision preference src: Although members of extremist groups represent only a minute portion of the population and present no serious threat to the government, authorities are concerned about the example set by the groups' violence, as well as by particular violent events. <SEP> tgt: Members of extremist groups represent only a minute portion of the population and present no serious threat to the government. Authorities are concerned about the example set by the groups' violence, as well as by particular violent events.