Why was Lankan team attacked in Pakistan?

Pakistanis have  been increasingly becoming compulsively and  overly obsessed with cricket matches in Pakistan so much that it  became a religion of religions, a spiritual exercise of  sort. Faithful would prefer to miss or cut short their prayers to watch cricket matches. Even children and those who wouldn’t get hang of anything of the sport would die to be in the stadium or watch the matches on T.V. just to imbibe the electrifying atmosphere. Religious meetings would be re-scheduled taking into the consideration the cricket matches. The attack was inevitable by the extremists. I have always wondered as to why the extremists spared the sport on the face of such a situation.