EGA has it exactly right.
There are idiots and racists all over the dial. While I wish there wasn't, we're fortunate as a nation that we have the choice to mute or tune away from them. But when we start screaming for their firing, we only help them and the otherwise lazy, harmful people who benefit from racism.
The more people scream and protest Imus the bigger his audience gets. The only people who benefit are Imus himself, his sponsors, the stations who broadcast him, and the professional poverty pimps without real jobs like Jackson and Sharpton, who can come in and blackmail and fleece the TV/radio stations to line their own pockets. But ultimately, if the sponsors aren't getting revenues from the listeners, the stations can't absorb the blackmail money from the poverty pimps and stay profitable. Then, Imus will cease to exist.....Unless, of course, he slides over to NPR.