I dont think "ISI" has one policy. Their Islamist cell definitely does NOT have any problems with failure to defeat certain terrorists that the state has decided to target. Their pro-China cell is OK with dragging things out. There seems to be no "pro-Pakistani-people" cell...you may be wrong in your assumption that they WANT things to get better in Pakistan in a "western" sense. Some of them really truly do think that a mess suits them just fine for now...