People are blaming the abrupt departure of Keith Olbermann from MSNBC on that company’s merger with Comcast and Olbermann’s loss of the protection and patronage of Jeff Zucker, the former head of NBC programming. MSNBC says that the issue has nothing to do with Comcast.It seems Olbermann is too extreme for US television. But Glenn Beck and Sean Hannity, now they are mainstream. What universe could that proposition be true in? That of cranky old white billionaires. And television news is owned by them. Not by you.