You know what they say:
“Better the Devil you know than the Devil you don’t ...”
Sure, Mubarak might have been a slimeball dictator, but he was the linchpin in keeping a lid on the Middle East. If the MB comes to power in Egypt, other nations [Saudi Arabia, Yemen, etc.] may also go - then theres REALLY gonna be a problem ...
Hey may be a son of a bitch, but he’s OUR son of a bitch - FDR (apocryphal)