Irony alert with some on the Left showing themselves very unclear on the concept

Is there a cause and effect between hate speech and violence?  These tweeters are certain there is, and they believe that Palin should be tortured, given loathsome diseases and killed for having the temerity to engage in (unidentified) hate speech:

[youtube]http://www.youtube.com/watch?v=QxgJKNpjSNI[/youtube]

Hat tip:  The Jawa Report