Even if Mr. Liddy is advocating wholesale slaughter of innocent people, the courts of the United States have established many times that he does have the right to do so. A recent survey showed that barely a majority of Americans believe that groups such as the Ku Klux Klan deserve unlimited freedom of speech. As soon as you start modifying existing laws to suit the situation, you place everybody at risk. If you do believe that the sight of an ATF agent means you need to defend yourself, then do it the right way - run. On the other hand, most of the Weaver family is still alive primarily because they laid down their weapons and negotiated with their enemies.
Hate radio is nothing new.
Whether it is the Klan or G. Gordon Liddy or even NPR's constant slamming of religion, there will always be talk show hosts that we disagree with and are angry at. But keep in mind that if you were on the air, many people would disagree with you, too. That's what free speech is all about. If you want to combat hate radio, quit listening. Mr. Liddy puts on a highly entertaining and informative show, but I quit listening to it because of his continuing advocacy of hatred for the government.