Apple Patent Overturned

Ooh.  Here's a big story.  The Patent behind Apple's $1Billion verdict over Samsung has been disavowed by the U.S. Patent Office.    Why companies tie up courts and wage legal wars over things like screen "bounce" is beyond me (well - I understand you do it if you can make money via suit, but why else?), and I don't really see how patent laws protecting such things make any sense.