I can't think of anything more activist then the "Citizen's United" case...except maybe Heller. Oh wait..there was Gore v. Bush. Scalia essentially said that was a one time emergency decision, never to be used again..
There is nothing activist about citizens united, they struck down a law based on previous precedent which found the assemblage of persons called a corporation did not lose their other first amendment rights based on the purpose of the assemblage. Now, if they had reversed the precedent and somehow found that an assemblage of persons could lose its other 1st ammendment rights based on its purpose for existing, that would have been activist, and wrong. It would seem your arguments as just a shallow as ever.
Judicial activism on the SCOTUS level is not defined by the courts doing something you or I don't agree with. It's a defined term where justices stretch the law, and the constitution beyond all reccognition by say, citing phrench law, to reach a predetermined opinion and/or write in some law that didn't exist in the process, like say Roe. The justices upholding a prior precedent and utilizing the judicial/legal philosophy of stare decisis is by definition... NOT ACTIVIST.