Really, we don't even know the personal lives of most artists and can guess that most have something to get outraged over. So there's a point that tossing art for the sins of an artist whose sins happen to be public is just a way of feeling like you're in control of something rather than application of some moral justice. But that’s a personal choice and fully justifiable.

But different circumstances are different. In the case of Dilbert, Adams has been putting his unpopular politics into the strip (see "Dave the Black Engineer" as the buzz-worthy example). And while there have been plenty of politically vocal and sometimes controversial comics (Doonesbury), I think a lot of newspapers just don't want to deal with a difficult guy and his toxic reputation anymore. Sometimes annoying people get fired or lose their contracts because what they provide isn't worth the trouble anymore. That's what this seems to be.