why is the bull running!

yesterday was a strange day....the sensex touched itz highest ever peak on a day when banks did buisness of just 1000 crore compared to the normal working of 10,000 crores due to the strike....I mean a few years back the sensex was so sensitive to even a mere speech by some politician that it would jump plunge nosedive within no time....but i fail to understand why these days the sensex knows only one way to go?? I remember few months back when the sensex touched 7000 P.Chidambram said that he will be really worried if the sensex touched 8000.....I wonder why is nobody questioning him now as much as he should have been....I found this link mentioning his interview...http://www.thehindubusinessline.com/2005/09/09/stories/2005090903470900.htm Apart from this nothing much has been expressed in print media... anyway...I am not here to grill the F.M. wat i am wondering is y in the world is sensex sky-rocketing???