The Muslim Brotherhood is not ruthless. Evil, yes. Genocidal, yes. Ruthless no. Mao was ruthless. Stalin was ruthless. Hitler was ruthless. The Syrians have been ruthless, as the Iranian Basaji and significant elements of Hizbuallah.
There are some of the Brotherhood who could be ruthless. And now chaos.
From Al Jazeera:
11 killed in Suez
20 Badly injured
Police stations set afire across the country
National museum cordoned off and protected by Egyptian youths.