Just to echo Mr. Spink's comments (with my own embellishments ;-)), it's important to reiterate both the initial constitutional intent and ongoing role of an independent judiciary in an established and purposed triumvirate government of responsible/accountable checks and balances.
What possible beneficient purpose would an independent Judicial branch of government serve if it merely validated and rubber-stamped all actions and laws enacted by the Executive and Legislative branches?
The abject ignorance and stupidity evinced by those that routinely complain that there's no "accountability" (to "the people") for rendered interpretations/decisions of constitutional law by our (state and federal) supreme courts is embarassingly pervasive in a nation that is supposedly the sower and shining beacon of freedom for those that seek it's realization in their own countries and lives.
Those crazy, "unaccountable","activist", independent-minded courts and justices!
Well...DUH.
THAT"S the whole IDEA. Courts and judges are supposed to be independent, and not subject to bribe, threat, or coercion from the other branches of government...or the whim and fancy of momentary popular majority or polling opinion. The courts (not Congress, nor the Presidency) are the ultimate guardians of constitutional protections and freedoms for ALL citizens.
How many times must it be said that we do not reside in a "pure" democracy of "mob rule"? "Majority opinion" (when expressed as a matter of criminal law or enforcible civic policy) that patently violates or prejudices the inherent constitutional rights of the few, or the one - can only be countered by a fully and completely independent justice system...with empowered judges "unaccountable" to any "majority opinion".
Laws (and law makers) are subject to societal trends/pressures/opinions that demand "immediate action" ("Somebody should do something about that!"). Weak and ineffective politicians will immediately bend and submit to "majority opinion" - heedless of any short or long-term ramifications upon our most cherished individual liberties. Mr. Rogers says, "Can you say...Patriot Act?".
When local, state, or federal lawmakers and/or elected executive officials mandate or enact civic policy or legislation (either purposefully in some declared communal "best interest"; or some manifestly stupid and ultimately regrettable knee-jerk reaction realized of contemporarily rash and indeliberative haste), a citizen's lone source in redress of personal grievance is the courts. Indeed, politicians are "accountable" to "the people", which is why (so very often) they act as stupidly and heedlessly as "the people" (and evinced "majority opinion") they presumably well represent.
Exceptional personal character and courage of independent though and insight is requisite to challenge a popular lynch mob hell-bent on a righteous hangin'. If "majority rule" actually did [rule]...there would be no need or purpose for an independent, "unaccountable to the people", judicially "supreme" branch of government. None.
The President is not a King, and Congress is not an infallible body of diligent defenders/guarantors of equal justice under constitutional law and precepts.
Allegations (and interpretations) of what constitutes or embodies "judicial activism" is most certainly within the circumspect eye of the beholder himself. I note that the most ardent objections to pending and established legal precedents on the part of courts of appeal, are those that found their counter-arguments primarily predicated upon/within either "majority opinion", or some invoked superior "moral authority".
[Can those that object to "gay marriage" cite any legal, constitutional rationale for it's continued legal prohibition? Not really, no. The primary, impotently proffered, and irrelevant argument is reapeatedly put forward - simply that..."I think homosexuality is immoral", and..."most people are against gays getting married".]
Thank the Founders for their foresight, personal experience, and penultimate wisdom in crafting a secular, self-governing republic, comprised of equally empowered and enabled governmental branches - and a judicious gardener in the form of an independent judiciary, that can prune the ugly and wild growths from the tree of liberty/equality that shades us all.