There are historical (read: deep-seated, ingrained, institutionalized) reasons for this sad state of affairs that pre-date Justice Scalia's birth.
But, the reality is that Benjamin Franklin's democratic "republic if you can keep it" set up for us 240 years ago is broken. And, its broken-ness has only been exacerbated by the disastrous SC/Scalia decision on "Citizens United."
While in a perfect world, the courts would not be used to create law, it came to that reality long ago. Citizens United, which undermines citizen democracy, will only make it more likely that courts will be forced to play a central role in order to remedy legislative and executive branches that becomes less interested in the concerns of common voices; and more in favor of those able to fund campaigns.
If Scalia's idealism was intended to correct our democracy back to using the legislative process most frequently, he (along with many other originalists) may have inadvertently produced the opposite effect.