Kenya’s boisterous news outlets are normally fierce rivals. But on Thursday they set aside their competitive instincts to issue an urgent appeal for calm as Kenya plunged deeper into chaotic anti-government demonstrations that have left at least 31 people dead in recent weeks and present the gravest challenge yet to the nearly year-old rule of President William Ruto. Ruto painted himself as the champion of Kenya’s “hustlers” — young people who, like him, had come from modest backgrounds and were striving to get ahead