Despite what Pakistani politicians might say, extremism isn't all cut and dried in a hugely diverse (and equally stratified) country of 170-odd million people. This article by Sabrina Tavernise in the NYT lays it out nicely.
In a country where whisky-happy politicians ban alcohol and bribe-taking lawyers confront military dictators, pretty much everything comes down to politics.
"The university's plight encapsulates Pakistan's predicament: an intolerant, aggressive minority terrorizes a more open-minded, peaceful majority, while an opportunistic political class dithers, benefiting from alliances with the aggressors."
Well worth a read.