In the most recent edition of The Nation, Christopher Hayes pens an essay on the vices and virtues of ideologues and pragmatists alike (Hat-tip: Ta-Nehisi Coates).
...privileging pragmatism over ideology, while perhaps understandable in the wake of the Bush years, misses the point. For one thing, as Glenn Greenwald has astutely pointed out on his blog, while ideology can lead decision-makers to ignore facts, it is also what sets the limiting conditions for any pragmatic calculation of interests. ...
Indeed, in the wake of the 9/11 attacks, "pragmatists" of all stripes--Alan Dershowitz, Richard Posner--lined up to offer tips and strategies on how best to implement a practical and effective torture regime; but ideologues said no torture, no exceptions. Same goes for the Iraq War, which many "pragmatic" lawmakers--Hillary Clinton, Arlen Specter--voted for and which ideologues across the political spectrum, from Ron Paul to Bernie Sanders, opposed. ... Particularly at times of crisis, when a polity succumbs to collective madness or delusion, it is only the obstinate ideologues who refuse to go along. Expediency may be a virtue in virtuous times, but it's a vice in vicious ones.
Read the full article here. (It gets better as it goes along, saving the best for last.)