The Crown Prince needs to consolidate his position and eliminate potential threats, lest the House of Saud descend into civil war and political fragmentation. Those "poor" members of the royal family, bureaucracy, and state-sponsored mercantile guilds are losers of the political faction war, who if they has been ascendant, would be the torturers and killers of the current Crown Prince's faction. Either the young man killed recently is an opposition faction member, or a very foolish and suicidal man gambling with his life disseminating sensitive information. He gambled and lost; in the sphere of power politics, miscalculation gets you in an unmarked mass grave.