Math, how does it work? The 9th has the highest number of reversals - of course it also has the largest territory, the largest number of judges (covering nine states and two territories, and with 28 judges) and does more cases, so when you look you'll find their percentage (do the math) is equal to others, in fact, last year in percentage terms they were 3rd.
Each year, Tom Goldstein, co-founder of the widely read SCOTUSblog, compiles and releases Supreme Court statistics. Last month, Mr. Goldstein released the final "Stat Pack" for the Supreme Court's most recent October 2010 term with these results: The Court reversed or vacated seventy-nine percent of the decisions it reviewed. Circuits with the highest percentage of reversals included the Sixth Circuit (eighty-three percent) and the Fifth Circuit (eighty percent). The Ninth Circuit came in third at seventy-nine percent....
In the October 2009 term, the circuit courts were reversed seventy-one percent of the time. That year, while the Supreme Court reversed eighty percent of Ninth Circuit cases, three other circuits plus the grouping of all appeals taken from state courts had higher reversal rates. The year prior, during the 2008 term, the Ninth Circuit was reversed only sixty percent of the time, well under the seventy-six percent reversal rate for all cases. Seven other circuits that year had higher reversal rates than the Ninth Circuit; six of them were reversed at the one-hundred percent level.
It's also a function of the cases they get. The West has the largest amounts of federal land - hence making more federal cases - and because of the intensity of industry in California in high tech, creative industries, and intellectual property areas, gets some of the most interesting cases too. They are seen as 'making new law' because so many of the things they are adjudicating are new problems.
And it's hardly activist, when all other courts when asked (including the Supreme Court of Iowa, not exactly your flaming radical bunch) have found that such laws are in violation of due process and/or equal protection (though this is the first finding that it violates BOTH of those at the same time). And exactly who is supposed to rule on Constitutional questions? Your favorite blog editor?
And if that is true, then we need to stop electing Republicans who put people like Walker in the federal judgeship in the first place (Ronald Reagan) and further elevated him to the 9th (G.H.W. Bush).